An embodiment relates generally to an electronic system, and more particularly to a system for media test and use.
Modern consumer and industrial electronic devices require storage of information, such as digital photographs, electronic mail, calendar, or contacts. These devices can be electronic systems, such as notebook computers, desktop computers, servers, televisions, and projectors, and are providing increasing levels of functionality to support modern life. Increased capacity and cost reductions are an ongoing market demand for storage in these systems.
Research and development in the existing technologies can take a myriad of different directions. One way to increase performance and reduce cost at the same time is to provide reliable products without excessively screening out potentially good products.
A need still remains for an electronic system with media recovery mechanism for improving yield and performance when writing. The improved yield and performance can be provided recognition and coping with transient conditions and treating it as a transient condition as oppose to a permanent condition. In view of the ever-increasing commercial competitive pressures, along with growing consumer expectations and the diminishing opportunities for meaningful product differentiation in the marketplace, it is increasingly critical that answers be found to these problems. Additionally, the need to reduce costs, improve efficiencies and performance, and meet competitive pressures adds an even greater urgency to the critical necessity for finding answers to these problems.
Solutions to these problems have been long sought but prior developments have not taught or suggested any solutions and, thus, solutions to these problems have long eluded those skilled in the art.
Certain embodiments have other steps or elements in addition to or in place of those mentioned above. The steps or elements will become apparent to those skilled in the art from a reading of the following detailed description when taken with reference to the accompanying drawings.
The following embodiments are described in sufficient detail to enable those skilled in the art to make and use the embodiments. It is to be understood that other embodiments would be evident based on the present disclosure, and that system, process, or mechanical changes may be made without departing from the scope of an embodiment.
In the following description, numerous specific details are given to provide a thorough understanding of the embodiments. However, it will be apparent that the embodiments can be practiced without these specific details. In order to avoid obscuring an embodiment, some well-known circuits, system configurations, and process steps are not disclosed in detail.
The drawings showing embodiments of the system are semi-diagrammatic, and not to scale and, particularly, some of the dimensions are for the clarity of presentation and are shown exaggerated in the drawing figures. Similarly, although the views in the drawings for ease of description generally show similar orientations, this depiction in the figures is arbitrary for the most part. Generally, an embodiment can be operated in any orientation. The embodiments have been numbered first embodiment, second embodiment, etc. as a matter of descriptive convenience and are not intended to have any other significance or provide limitations for an embodiment. For reference purposes the data surface of the media is defined as being “horizontal” though it is understood that the electronic system can operate at any angle. Position of the head over the media is referred to as a “vertical” displacement or flying height.
Referring now to
The electronic system 100 including a head 102 actuated over a media 104. The head 102 can be mounted to a flex arm 118 attached to an actuator arm 122. The head 102 (
The media 104 is a structure for storing information. For example, the media 104 can be made of an aluminum alloy, ceramic/glass, or a similar non-magnetic material. The top and bottom surfaces of the media 104 can be covered with magnetic material deposited on one or both sides of the media 104 to form a coating layer capable of magnetization. As an example, the media 104 can be a disk platter for one embodiment of the electronic system 100 as a rotating storage system, such as a hard disk drive (HDD). As a further example, the media 104 can be a linear magnetic strip for one embodiment of the electronic system 100 as a linear storage system, such as a tape drive.
The laser 106, as an example, can be a laser diode or other solid-state based lasers. In addition, embodiments can employ any suitable techniques for focusing the laser 106 on the media 104, such as a suitable waveguide, magnifying lens, or other suitable optics. The laser 106 is increased to a write power in order to heat the disk, thereby decreasing the coercivity of the media 104 so that the data is written more reliably.
The spindle motor 114 can rotate the media 104, about a center of the media 104, at constant or varying speed 107. For illustrative purposes, the spindle motor 114 is described as a motor for a rotation, although it is understood that the spindle motor 114 can be other actuating motors for a tape drive, as an example.
As examples, a motor assembly 130 can be a voice coil motor assembly, a stepper motor assembly, or a combination thereof. The motor assembly 130 can generate a torque or force for positioning the head 102.
A tapered end of the flex arm 118 can include the head 102. The flex arm 118 can be mounted to the actuator arm 122, which is pivoted around a bearing assembly 126 by the torque generated by the motor assembly 130. The head 102 can include a single instance of the write element 110 and a single instance of the read element 112 that is narrower than the write element 110. The head 102 can fly over the media 104 at a dynamically adjustable span of the flying height 108, which represents a vertical displacement between the head 102 and the media 104. The head 102 can be positioned by the flex arm 118 and the actuator arm 122 and can have the flying height 108 adjusted by control circuitry 138.
The head 102 can be positioned over the media 104 along an arc shaped path between an inner diameter of the media 104 and outer diameter of the media 104. For illustrative purposes, the actuator arm 122 and the motor assembly 130 are configured for rotary movement of the head 102. The actuator arm 122 and the motor assembly 130 can be configured to have a different movement. For example, the actuator arm 122 and the motor assembly 130 could be configured to have a linear movement resulting in the head 102 traveling along a radius of the media 104.
The head 102 can be positioned over the media 104 to create magnetic transitions or detect magnetic transitions from the coating layer that can be used to representing written data or read data, respectively. The position of the head 102 and the speed 107 of the media 104 can be controlled by the control circuitry 138. Examples of the control circuitry 138 can include a processor, an application specific integrated circuit (ASIC) an embedded processor, a microprocessor, a hardware control logic, a hardware finite state machine (FSM), a digital signal processor (DSP), digital circuitry, analog circuitry, optical circuitry, or a combination thereof. The control circuitry 138 can also include memory devices, such as a volatile memory, a nonvolatile memory, or a combination thereof. For example, the nonvolatile storage can be non-volatile random access memory (NVRAM) or Flash memory and a volatile storage can be static random access memory (SRAM) or dynamic random access memory (DRAM).
A system interface 140 can couple the control circuitry 138 to a host electronics (not shown). The system interface 140 can transfer user data 142 between the host electronics and the control circuitry 138. The user data 142 can be encoded or decoded by the control circuitry 138 in preparation for transfer to or from the media 104.
The control circuitry 138 can be configured to control the spindle motor 114 for adjusting the speed 107 of the media 104. The control circuitry 138 can be configured to cause the head 102 to move relative to the media 104, or vice versa. The control circuitry 138 can also be configured to control the flow of information to the head 102 for writing to the media 104. The information sent to the head 102 can include the preconditioning pattern, direct current erase signals, user data, or a combination thereof.
Lube waterfall (LWF) is a transient phenomenon that affects recording performance when a head 102 is loaded after extended flying followed by a long duration of parking on a loading ramp 132. During extended actuation of the head 102, lube is picked up from the surface of the media 104, and moved to a deposit end 111 of the head 102. When the head 102 rests on the loading ramp 132, lube flows back to and coats the air bearing surface (ABS) 113, due to free energy decrease and diffusion effect. When the head 102 is relocated from the loading ramp 132 to the media 104, the head 102 can fly too high above the media 104 due to the extra coating of lube that has migrated onto the ABS 113. Writing data with excessive fly height or magnetic spacing can cause write errors due to the poor magnetic coupling between the head 102 and the media 104. Typically after 1-2 minutes of operation the head 102 will return to the normal fly height because the lube moves back to the deposit end 111 due to air flow.
The detrimental effect of LWF is proportional to the sensitivity of recording performance of the head 102 and media 104 pair due to magnetic spacing variation. The sensitivity of recording performance of the head 102 and media 104 pair increasing with increasing Bits per Inch (BPI) density. In other words, the impact of this issue will constantly increase as drive capacity increases.
The failure probability due to LWF has been observed to be drastically different between “serpentine” and “ordered zone” drive architecture. The serpentine architecture can perform writes on each of the heads in a disk drive before switching to the next sequential track to continue writing. By forcing the drive to write using all the heads 102 within the first few minutes of write upon power-on, the serpentine architecture has more chance to produce a write error since, if any head 102 in an electronic system 100 is susceptible to LWF-induced failure, the failure probability is 100%.
In contrast, the ordered zone architecture can spend the entire duration of the transient LWF condition writing on a single head 102. The ordered zone architecture has a failure probability between 1/n (n=number of head in drive) and 100%.
The transient LWF susceptibility can be measured during the manufacturing process by a LWF stress test. For example the LWF stress test consists of (i) measuring write capability parametric, e.g., Over Write (OW), Error Margin (EM), Resolution (RES), (ii) parking head 102, on the loading ramp 132, for 5 hours or more (pre-conditioning time) with power off, (iii) power on, load the head 102 from the loading ramp 132 to the media 104 and immediately issue a time-limited (e.g., 2 minutes) write command, (iv) measure OW & EM after write command completion, (v) read back the written data with error retries disabled for determining the margin data, including the over write and the error margin. The heads 102 demonstrating high LWF susceptibility will be detected by errors written to the media. Margin data of the head 102 against LWF susceptibility will be ranked by OW & EM delta between pre-conditioning measurements and post-test results.
As determined by LWF testing, the flying height increase due to LWF significantly varies between the heads 102, within an electronic system 100, and there are statistically 10%, as an example, of the heads 102 that demonstrate high sensitivity to lubricant waterfall (LWF) testing. On the other hand, there is a very high probability that any of the electronic system 100 has at least one of the heads 102 with very low or no sensitivity to LWF.
In one embodiment, the electronic system 100 further comprises control circuitry 138 configured to execute the flow diagrams of
For an embodiment with CMR, in the block 144, this step can apply to an embodiment undergoing LWF stress test, for example, during the Back End process for the electronic system 100, such as a manufacturing test fixture, a hard disk drive, a tape drive, or a hybrid drive. This step can also measure the susceptibility of the head 102 or multiple instances of the head 102 to LWF. For example, Pass/Fail can be determined by evaluating margin data, such as OW/EM/RES performance, of each head 102 with optimized pass/fail limits. If no head 102 can pass this test, the electronic system 100 fails the BE process. In one embodiment, the failure rate and yield loss is very low since a drive passes if at least one head 102 in it passes the limits.
In the block 146, this step selects the operational heads 102. The operational heads 102 are operational or acceptable within pass limits under the LWF stress test. In an embodiment, this step can also select the most robust head 102 out of those that are operational. A most robust head 102 is one that is less susceptible to LWF. A record in the boot block can be updated to reflect which of the heads 102 demonstrates the least susceptibility to the LWF criteria. The boot block can list all of the heads, which demonstrate acceptable performance based on the LWF test criteria, in priority order.
In the block 148, this step can write to a media based cache (MBC), using one of the operational heads 102 or as a more specific example the most robust head 102 against LWF. The selection of one of the operational heads 102, which is not necessarily the most robust head 102 under LWF stress test, can provide performance improvements for the write operation if, for example, that head 102 is already on the side of the media 104 where the media based cache is to be written.
As an example, this step can take place after a power on. The media based cache can be a portion of the media 104 reserved for use as a cache. Other examples for the cache can include non-volatile memory as part of the electronic system 100, volatile memory as part of the electronic system 100, user area on the media 104, on a side or a portion of a side of the media 104, or a combination thereof.
For an embodiment with SMR, in the block 150, this step can apply to an embodiment undergoing LWF stress test, for example, during the Back End process for the electronic system 100, such as a manufacturing test fixture, a hard disk drive or tape drive or a hybrid drive. This step can also measure the susceptibility of the head 102 or multiple instances of the head 102 to LWF. For example, Pass/Fail can be determined by evaluating the margin data, such as OW/EM/RES performance, of each head 102 with optimized pass/fail limits. If no head 102 can pass this test, the electronic system 100 fails the BE process. In one embodiment, the failure rate and yield loss is very low since a drive passes if at least one of the heads 102 in it passes the limits.
In the block 152, this step selects the operational heads 102. These heads 102 are operational within pass limits under the LWF stress test. In an embodiment, this step can also select the most robust head 102 out of those that are operational. A most robust head 102 is one that is the least susceptible to LWF. This step can determine the most robust (least susceptible) head 102 and save this determination for later use. The saved determination can list all of the heads, which demonstrate acceptable performance based on the LWF test criteria, in priority order.
In the block 154, this step can, for example, takes place after a power up and/or during the reading of the current active zones/heads for host writes, garbage collection and/or defragmentation. The step can interrogate an active zones table to determine if the current selected head 102 is operational or the most robust for LWF. If not, this step can close the active zone and select a new zone from the pool of free zones with the operational head 102 or the most robust head 102 for LWF operations. The active zones table can be read from the media 104 as part of the power-on initialization process and subsequent accesses can be from memory managed by the control circuitry 138.
In the block 156, this step can continue to confine the active zone selection process to the operational head 102, or the most robust head 102 having available zones, for a predetermined period of time. During the predetermined period of time all write commands received from the system interface 120 can be constrained to the active zone and the operational head, without regard to the destination logical block address of the write command. The active zone provides a media based cache accessed by the operational head for all write commands during the predetermined period of time.
It has been discovered that an embodiment of the electronic system 100 can improve manufacturing yield. By way of an example, testing a prior art disk drive, having 10 of the heads 102, for the LWF condition by the prior art method (all heads must pass LWF test) can typically identify 5% of the prior art disk drives that fail to meet requirements. An embodiment of the electronic system 100 can reduce the LWF failure rate to 0% because the probability that any single unit of the head 102 will pass the LWF test is 99.5%. Similarly the prior art disk drive having two heads tested by the prior art LWF method can identify 1% of the manufacturing volume that fails the LWF test. An embodiment of the electronic system 100 can reduce the LWF failure rate to 0% for a two head version because the probability that any single unit of the head 102 will pass the LWF test is 99.5%.
Additional details related to the flow diagrams will be provided below in conjunction with
It has been discovered that an embodiment improves yield from the manufacturing line while providing good drives that can operate through the transient effects from LWF. While failure probability due to LWF on serpentine architecture is 100% of the head-basis probability (10-20%), and the ordered zone architecture has a failure probability between (1/n)x and 1x (10-20%), the method herein described has a failure probability of near 0% in the field since drive will be screened in the Back End process. While a direct drive process screen can achieve the same result, it will generate high yield loss since the performance of a drive is judged by the performance of the weakest head within the drive, while an embodiment will judge drives by the strongest head performance and yield loss will be negligible.
An embodiment can be implemented in firmware to select the head 102, recorded in the boot block, that will write to the media based cache, for the first few minutes after power on, in spite any host commands to write to specific logical block address (LBA). This will eliminate lube waterfall (LWF) induced failures in the electronic system 100.
Referring now to
In one embodiment, frequently written logical block addresses (LBAs) can be written to the non-shingled data tracks 210 of a non-shingle zone 212 and infrequently written LBAs are written to the shingle data tracks 202 of the shingle zone 204. This increases the overall capacity of the electronic system 100 since the radial density or linear density of the shingle data tracks 202 can be significantly higher than the radial density of the non-shingled data tracks 210. The performance of the electronic system 100 is not significantly impacted by the clean-up process known as “garbage collection,” which is performed on the shingle zone 204, since update writes occur at a lower frequency. The clean-up process can include an initialization of a number of the shingle data tracks 202 that require update and is performed by writing the preconditioning pattern across any residual information on the number of the shingle data tracks 202. Once the shingle data tracks 202 have been initialized, they are once again available for use.
In another embodiment, the lower radial density of the non-shingled data tracks 210 in the non-shingle zone 212 can increase performance by avoiding (or reducing) the need to perform write verify operations, whereas the higher radial density of the shingled shingle data tracks 202 in the non-shingle zone 212 can reduce performance due to a need to perform write verify operations. Storing data associated with infrequently written LBAs in the shingled shingle data tracks 202 of the shingle zone 204 reduces the frequency of corresponding write verify operations while increasing the overall capacity of the electronic system 100. Although
For illustrative purposes, the media 104 is described with the data stored with the shingled structure or format with the shingle data tracks 202 and the shingle zone 204, although it is understood that the media 104 can be store user data and drive format data differently. For example, the media 104 can store user data or drive format data with non-overlapping format with data tracks and without the shingle zone 204.
Referring now to
As an embodiment, the MBC can be distributed among the recording sides for each of the media 104. The media 104 or the side of the media 104 designated for MBC, information (user data or drive formatting data) can have different formats than media 104 that are not designated as MBC. For example, information written to MBC can be written with different track pitch, bit spacing/frequency, double writing (repeat same data or different coding scheme).
Designation of a portion of the media 104, a side of the media 104, or which of the head 102 for MBC can be done at manufacturing time. The designation for MBC can also be done in the field. The adjustment can be made as the head 102 and the media 104 combination has degraded in the field.
Among the plurality of the head 102, one or some can be determined to be the most robust or less susceptible to LWF failures. The most robust head 102 can be designated as the operational head 102 and can be used to write to the active zone on its surface of the media 104 as the MBC for the predetermined time of the transient LWF condition.
In an attempt to shorten the duration of the transient LWF condition, the control circuitry 138 of
Referring now to
The method 400 with SMR includes: applying LWF stress test during the Back End (BE) process, and measuring head susceptibility to LWF in a block 408; determining a head as operational under LWF and saving this determination in a block 410; during reading of current active zones/heads for host writes, garbage collection and/or defragmentation, determining if the current selected head is the operational head under LWF in a block 412; and continuing to confine the active zone selection process to the operational LWF head zones for predetermined time period, by closing the active zone accessed by the currently selected head, selecting a different active zone with one of the heads different from the currently selected head, or confining the selected different active zone to the operational head in a block 414.
The resulting method, process, apparatus, device, product, and/or system is straightforward, cost-effective, uncomplicated, highly versatile, accurate, sensitive, and effective, and can be implemented by adapting known components for ready, efficient, and economical manufacturing, application, and utilization. Another important aspect of an embodiment is that it valuably supports and services the historical trend of reducing costs, simplifying systems, and increasing performance.
These and other valuable aspects of an embodiment consequently further the state of the technology to at least the next level.
While the embodiment has been described in conjunction with a specific best mode, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims. All matters set forth herein or shown in the accompanying drawings are to be interpreted in an illustrative and non-limiting sense.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/933,139 filed Jan. 29, 2014, and the subject matter thereof is incorporated herein by reference thereto.
Number | Name | Date | Kind |
---|---|---|---|
4490766 | Hill et al. | Dec 1984 | A |
5850321 | McNeil et al. | Dec 1998 | A |
6018789 | Sokolov et al. | Jan 2000 | A |
6065095 | Sokolov et al. | May 2000 | A |
6078452 | Kittilson et al. | Jun 2000 | A |
6081447 | Lofgren et al. | Jun 2000 | A |
6092149 | Hicken et al. | Jul 2000 | A |
6092150 | Sokolov et al. | Jul 2000 | A |
6094707 | Sokolov et al. | Jul 2000 | A |
6105104 | Guttmann et al. | Aug 2000 | A |
6111717 | Cloke et al. | Aug 2000 | A |
6145052 | Howe et al. | Nov 2000 | A |
6175893 | D'Souza et al. | Jan 2001 | B1 |
6178056 | Cloke et al. | Jan 2001 | B1 |
6191909 | Cloke et al. | Feb 2001 | B1 |
6195218 | Guttmann et al. | Feb 2001 | B1 |
6205494 | Williams | Mar 2001 | B1 |
6208477 | Cloke et al. | Mar 2001 | B1 |
6223303 | Billings et al. | Apr 2001 | B1 |
6230233 | Lofgren et al. | May 2001 | B1 |
6246346 | Cloke et al. | Jun 2001 | B1 |
6249393 | Billings et al. | Jun 2001 | B1 |
6256695 | Williams | Jul 2001 | B1 |
6262857 | Hull et al. | Jul 2001 | B1 |
6263459 | Schibilla | Jul 2001 | B1 |
6272694 | Weaver et al. | Aug 2001 | B1 |
6278568 | Cloke et al. | Aug 2001 | B1 |
6279089 | Schibilla et al. | Aug 2001 | B1 |
6289484 | Rothberg et al. | Sep 2001 | B1 |
6292912 | Cloke et al. | Sep 2001 | B1 |
6310740 | Dunbar et al. | Oct 2001 | B1 |
6317850 | Rothberg | Nov 2001 | B1 |
6327106 | Rothberg | Dec 2001 | B1 |
6337778 | Gagne | Jan 2002 | B1 |
6356405 | Gui et al. | Mar 2002 | B1 |
6369969 | Christiansen et al. | Apr 2002 | B1 |
6373658 | Gui et al. | Apr 2002 | B2 |
6384999 | Schibilla | May 2002 | B1 |
6388833 | Golowka et al. | May 2002 | B1 |
6405342 | Lee | Jun 2002 | B1 |
6408357 | Hanmann et al. | Jun 2002 | B1 |
6408406 | Parris | Jun 2002 | B1 |
6411452 | Cloke | Jun 2002 | B1 |
6411458 | Billings et al. | Jun 2002 | B1 |
6412083 | Rothberg et al. | Jun 2002 | B1 |
6415349 | Hull et al. | Jul 2002 | B1 |
6425128 | Krapf et al. | Jul 2002 | B1 |
6441981 | Cloke et al. | Aug 2002 | B1 |
6442328 | Elliott et al. | Aug 2002 | B1 |
6445524 | Nazarian et al. | Sep 2002 | B1 |
6449767 | Krapf et al. | Sep 2002 | B1 |
6453115 | Boyle | Sep 2002 | B1 |
6470420 | Hospodor | Oct 2002 | B1 |
6480020 | Jung et al. | Nov 2002 | B1 |
6480349 | Kim et al. | Nov 2002 | B1 |
6480932 | Vallis et al. | Nov 2002 | B1 |
6483986 | Krapf | Nov 2002 | B1 |
6487032 | Cloke et al. | Nov 2002 | B1 |
6490635 | Holmes | Dec 2002 | B1 |
6493168 | French et al. | Dec 2002 | B1 |
6493173 | Kim et al. | Dec 2002 | B1 |
6493184 | Smith | Dec 2002 | B1 |
6499083 | Hamlin | Dec 2002 | B1 |
6519104 | Cloke et al. | Feb 2003 | B1 |
6525892 | Dunbar et al. | Feb 2003 | B1 |
6545830 | Briggs et al. | Apr 2003 | B1 |
6546489 | Frank, Jr. et al. | Apr 2003 | B1 |
6550021 | Dalphy et al. | Apr 2003 | B1 |
6552880 | Dunbar et al. | Apr 2003 | B1 |
6553457 | Wilkins et al. | Apr 2003 | B1 |
6578106 | Price | Jun 2003 | B1 |
6580573 | Hull et al. | Jun 2003 | B1 |
6594183 | Lofgren et al. | Jul 2003 | B1 |
6600620 | Krounbi et al. | Jul 2003 | B1 |
6601137 | Castro et al. | Jul 2003 | B1 |
6603622 | Christiansen et al. | Aug 2003 | B1 |
6603625 | Hospodor et al. | Aug 2003 | B1 |
6604220 | Lee | Aug 2003 | B1 |
6606682 | Dang et al. | Aug 2003 | B1 |
6606714 | Thelin | Aug 2003 | B1 |
6606717 | Yu et al. | Aug 2003 | B1 |
6611393 | Nguyen et al. | Aug 2003 | B1 |
6615312 | Hamlin et al. | Sep 2003 | B1 |
6639748 | Christiansen et al. | Oct 2003 | B1 |
6647481 | Luu et al. | Nov 2003 | B1 |
6654193 | Thelin | Nov 2003 | B1 |
6657810 | Kupferman | Dec 2003 | B1 |
6661591 | Rothberg | Dec 2003 | B1 |
6665772 | Hamlin | Dec 2003 | B1 |
6687073 | Kupferman | Feb 2004 | B1 |
6687078 | Kim | Feb 2004 | B1 |
6687850 | Rothberg | Feb 2004 | B1 |
6690523 | Nguyen et al. | Feb 2004 | B1 |
6690882 | Hanmann et al. | Feb 2004 | B1 |
6691198 | Hamlin | Feb 2004 | B1 |
6691213 | Luu et al. | Feb 2004 | B1 |
6691255 | Rothberg et al. | Feb 2004 | B1 |
6693760 | Krounbi et al. | Feb 2004 | B1 |
6694477 | Lee | Feb 2004 | B1 |
6697914 | Hospodor et al. | Feb 2004 | B1 |
6704153 | Rothberg et al. | Mar 2004 | B1 |
6708251 | Boyle et al. | Mar 2004 | B1 |
6710951 | Cloke | Mar 2004 | B1 |
6711628 | Thelin | Mar 2004 | B1 |
6711635 | Wang | Mar 2004 | B1 |
6711660 | Milne et al. | Mar 2004 | B1 |
6715044 | Lofgren et al. | Mar 2004 | B2 |
6724982 | Hamlin | Apr 2004 | B1 |
6725329 | Ng et al. | Apr 2004 | B1 |
6735650 | Rothberg | May 2004 | B1 |
6735693 | Hamlin | May 2004 | B1 |
6744772 | Eneboe et al. | Jun 2004 | B1 |
6745283 | Dang | Jun 2004 | B1 |
6751402 | Elliott et al. | Jun 2004 | B1 |
6757481 | Nazarian et al. | Jun 2004 | B1 |
6760175 | Smith | Jul 2004 | B2 |
6772281 | Hamlin | Aug 2004 | B2 |
6781826 | Goldstone et al. | Aug 2004 | B1 |
6782449 | Codilian et al. | Aug 2004 | B1 |
6791779 | Singh et al. | Sep 2004 | B1 |
6792486 | Hanan et al. | Sep 2004 | B1 |
6799274 | Hamlin | Sep 2004 | B1 |
6811427 | Garrett et al. | Nov 2004 | B2 |
6826003 | Subrahmanyam | Nov 2004 | B1 |
6826614 | Hanmann et al. | Nov 2004 | B1 |
6832041 | Boyle | Dec 2004 | B1 |
6832929 | Garrett et al. | Dec 2004 | B2 |
6845405 | Thelin | Jan 2005 | B1 |
6845427 | Atai-Azimi | Jan 2005 | B1 |
6850443 | Lofgren et al. | Feb 2005 | B2 |
6851055 | Boyle et al. | Feb 2005 | B1 |
6851063 | Boyle et al. | Feb 2005 | B1 |
6853731 | Boyle et al. | Feb 2005 | B1 |
6854022 | Thelin | Feb 2005 | B1 |
6862660 | Wilkins et al. | Mar 2005 | B1 |
6880043 | Castro et al. | Apr 2005 | B1 |
6882486 | Kupferman | Apr 2005 | B1 |
6884085 | Goldstone | Apr 2005 | B1 |
6888831 | Hospodor et al. | May 2005 | B1 |
6892217 | Hanmann et al. | May 2005 | B1 |
6892249 | Codilian et al. | May 2005 | B1 |
6892313 | Codilian et al. | May 2005 | B1 |
6895455 | Rothberg | May 2005 | B1 |
6895500 | Rothberg | May 2005 | B1 |
6898730 | Hanan | May 2005 | B1 |
6910099 | Wang et al. | Jun 2005 | B1 |
6928470 | Hamlin | Aug 2005 | B1 |
6931439 | Hanmann et al. | Aug 2005 | B1 |
6934104 | Kupferman | Aug 2005 | B1 |
6934713 | Schwartz et al. | Aug 2005 | B2 |
6940873 | Boyle et al. | Sep 2005 | B2 |
6943978 | Lee | Sep 2005 | B1 |
6948165 | Luu et al. | Sep 2005 | B1 |
6950267 | Liu et al. | Sep 2005 | B1 |
6954733 | Ellis et al. | Oct 2005 | B1 |
6961814 | Thelin et al. | Nov 2005 | B1 |
6965489 | Lee et al. | Nov 2005 | B1 |
6965563 | Hospodor et al. | Nov 2005 | B1 |
6965966 | Rothberg et al. | Nov 2005 | B1 |
6967799 | Lee | Nov 2005 | B1 |
6968422 | Codilian et al. | Nov 2005 | B1 |
6968450 | Rothberg et al. | Nov 2005 | B1 |
6973495 | Milne et al. | Dec 2005 | B1 |
6973570 | Hamlin | Dec 2005 | B1 |
6976190 | Goldstone | Dec 2005 | B1 |
6983316 | Milne et al. | Jan 2006 | B1 |
6986007 | Procyk et al. | Jan 2006 | B1 |
6986154 | Price et al. | Jan 2006 | B1 |
6995933 | Codilian et al. | Feb 2006 | B1 |
6996501 | Rothberg | Feb 2006 | B1 |
6996669 | Dang et al. | Feb 2006 | B1 |
7002926 | Eneboe et al. | Feb 2006 | B1 |
7003674 | Hamlin | Feb 2006 | B1 |
7006316 | Sargenti, Jr. et al. | Feb 2006 | B1 |
7009820 | Hogg | Mar 2006 | B1 |
7023639 | Kupferman | Apr 2006 | B1 |
7024491 | Hanmann et al. | Apr 2006 | B1 |
7024549 | Luu et al. | Apr 2006 | B1 |
7024614 | Thelin et al. | Apr 2006 | B1 |
7027716 | Boyle et al. | Apr 2006 | B1 |
7028174 | Atai-Azimi et al. | Apr 2006 | B1 |
7031902 | Catiller | Apr 2006 | B1 |
7046465 | Kupferman | May 2006 | B1 |
7046488 | Hogg | May 2006 | B1 |
7050252 | Vallis | May 2006 | B1 |
7054937 | Milne et al. | May 2006 | B1 |
7055000 | Severtson | May 2006 | B1 |
7055167 | Masters | May 2006 | B1 |
7057836 | Kupferman | Jun 2006 | B1 |
7062398 | Rothberg | Jun 2006 | B1 |
7075746 | Kupferman | Jul 2006 | B1 |
7076604 | Thelin | Jul 2006 | B1 |
7082494 | Thelin et al. | Jul 2006 | B1 |
7088538 | Codilian et al. | Aug 2006 | B1 |
7088545 | Singh et al. | Aug 2006 | B1 |
7092186 | Hogg | Aug 2006 | B1 |
7095577 | Codilian et al. | Aug 2006 | B1 |
7099095 | Subrahmanyam et al. | Aug 2006 | B1 |
7106537 | Bennett | Sep 2006 | B1 |
7106947 | Boyle et al. | Sep 2006 | B2 |
7110202 | Vasquez | Sep 2006 | B1 |
7111116 | Boyle et al. | Sep 2006 | B1 |
7114029 | Thelin | Sep 2006 | B1 |
7120737 | Thelin | Oct 2006 | B1 |
7120806 | Codilian et al. | Oct 2006 | B1 |
7126776 | Warren, Jr. et al. | Oct 2006 | B1 |
7129763 | Bennett et al. | Oct 2006 | B1 |
7133600 | Boyle | Nov 2006 | B1 |
7136244 | Rothberg | Nov 2006 | B1 |
7146094 | Boyle | Dec 2006 | B1 |
7149046 | Coker et al. | Dec 2006 | B1 |
7150036 | Milne et al. | Dec 2006 | B1 |
7155616 | Hamlin | Dec 2006 | B1 |
7171108 | Masters et al. | Jan 2007 | B1 |
7171110 | Wilshire | Jan 2007 | B1 |
7194576 | Boyle | Mar 2007 | B1 |
7200698 | Rothberg | Apr 2007 | B1 |
7205805 | Bennett | Apr 2007 | B1 |
7206497 | Boyle et al. | Apr 2007 | B1 |
7215496 | Kupferman et al. | May 2007 | B1 |
7215771 | Hamlin | May 2007 | B1 |
7237054 | Cain et al. | Jun 2007 | B1 |
7240161 | Boyle | Jul 2007 | B1 |
7249365 | Price et al. | Jul 2007 | B1 |
7263709 | Krapf | Aug 2007 | B1 |
7274639 | Codilian et al. | Sep 2007 | B1 |
7274659 | Hospodor | Sep 2007 | B2 |
7275116 | Hanmann et al. | Sep 2007 | B1 |
7280302 | Masiewicz | Oct 2007 | B1 |
7292774 | Masters et al. | Nov 2007 | B1 |
7292775 | Boyle et al. | Nov 2007 | B1 |
7296284 | Price et al. | Nov 2007 | B1 |
7302501 | Cain et al. | Nov 2007 | B1 |
7302579 | Cain et al. | Nov 2007 | B1 |
7318088 | Mann | Jan 2008 | B1 |
7319806 | Willner et al. | Jan 2008 | B1 |
7325244 | Boyle et al. | Jan 2008 | B2 |
7330323 | Singh et al. | Feb 2008 | B1 |
7346790 | Klein | Mar 2008 | B1 |
7366641 | Masiewicz et al. | Apr 2008 | B1 |
7369340 | Dang et al. | May 2008 | B1 |
7369343 | Yeo et al. | May 2008 | B1 |
7372650 | Kupferman | May 2008 | B1 |
7380147 | Sun | May 2008 | B1 |
7392340 | Dang et al. | Jun 2008 | B1 |
7404013 | Masiewicz | Jul 2008 | B1 |
7406545 | Rothberg et al. | Jul 2008 | B1 |
7415571 | Hanan | Aug 2008 | B1 |
7436610 | Thelin | Oct 2008 | B1 |
7437502 | Coker | Oct 2008 | B1 |
7440214 | Ell et al. | Oct 2008 | B1 |
7451344 | Rothberg | Nov 2008 | B1 |
7471483 | Ferris et al. | Dec 2008 | B1 |
7471486 | Coker et al. | Dec 2008 | B1 |
7486060 | Bennett | Feb 2009 | B1 |
7496493 | Stevens | Feb 2009 | B1 |
7518819 | Yu et al. | Apr 2009 | B1 |
7526184 | Parkinen et al. | Apr 2009 | B1 |
7539924 | Vasquez et al. | May 2009 | B1 |
7543117 | Hanan | Jun 2009 | B1 |
7551383 | Kupferman | Jun 2009 | B1 |
7562282 | Rothberg | Jul 2009 | B1 |
7577973 | Kapner, III et al. | Aug 2009 | B1 |
7596797 | Kapner, III et al. | Sep 2009 | B1 |
7599139 | Bombet et al. | Oct 2009 | B1 |
7619841 | Kupferman | Nov 2009 | B1 |
7647544 | Masiewicz | Jan 2010 | B1 |
7649704 | Bombet et al. | Jan 2010 | B1 |
7653927 | Kapner, III et al. | Jan 2010 | B1 |
7656603 | Feb 2010 | B1 | |
7656763 | Jin et al. | Feb 2010 | B1 |
7657149 | Boyle | Feb 2010 | B2 |
7672072 | Boyle et al. | Mar 2010 | B1 |
7673075 | Masiewicz | Mar 2010 | B1 |
7688540 | Mei et al. | Mar 2010 | B1 |
7724461 | McFadyen et al. | May 2010 | B1 |
7725584 | Hanmann et al. | May 2010 | B1 |
7730295 | Lee | Jun 2010 | B1 |
7760458 | Trinh | Jul 2010 | B1 |
7768776 | Szeremeta et al. | Aug 2010 | B1 |
7804657 | Hogg et al. | Sep 2010 | B1 |
7813954 | Price et al. | Oct 2010 | B1 |
7817372 | Takahashi | Oct 2010 | B2 |
7827320 | Stevens | Nov 2010 | B1 |
7839588 | Dang et al. | Nov 2010 | B1 |
7843660 | Yeo | Nov 2010 | B1 |
7852596 | Boyle et al. | Dec 2010 | B2 |
7859782 | Lee | Dec 2010 | B1 |
7872822 | Rothberg | Jan 2011 | B1 |
7898756 | Wang | Mar 2011 | B1 |
7898762 | Guo et al. | Mar 2011 | B1 |
7900037 | Fallone et al. | Mar 2011 | B1 |
7907364 | Boyle et al. | Mar 2011 | B2 |
7929234 | Boyle et al. | Apr 2011 | B1 |
7933087 | Tsai et al. | Apr 2011 | B1 |
7933090 | Jung et al. | Apr 2011 | B1 |
7934030 | Sargenti, Jr. et al. | Apr 2011 | B1 |
7940491 | Szeremeta et al. | May 2011 | B2 |
7944639 | Wang | May 2011 | B1 |
7945727 | Rothberg et al. | May 2011 | B2 |
7949564 | Hughes et al. | May 2011 | B1 |
7974029 | Tsai et al. | Jul 2011 | B2 |
7974039 | Xu et al. | Jul 2011 | B1 |
7982993 | Tsai et al. | Jul 2011 | B1 |
7984200 | Bombet et al. | Jul 2011 | B1 |
7990648 | Wang | Aug 2011 | B1 |
7992179 | Kapner, III et al. | Aug 2011 | B1 |
8004785 | Tsai et al. | Aug 2011 | B1 |
8006027 | Stevens et al. | Aug 2011 | B1 |
8014094 | Jin | Sep 2011 | B1 |
8014977 | Masiewicz et al. | Sep 2011 | B1 |
8019914 | Vasquez et al. | Sep 2011 | B1 |
8040625 | Boyle et al. | Oct 2011 | B1 |
8068306 | Ramamoorthy et al. | Nov 2011 | B2 |
8078943 | Lee | Dec 2011 | B1 |
8079045 | Krapf et al. | Dec 2011 | B2 |
8082433 | Fallone et al. | Dec 2011 | B1 |
8085487 | Jung et al. | Dec 2011 | B1 |
8089719 | Dakroub | Jan 2012 | B1 |
8090902 | Bennett et al. | Jan 2012 | B1 |
8090906 | Blaha et al. | Jan 2012 | B1 |
8091112 | Elliott et al. | Jan 2012 | B1 |
8094396 | Zhang et al. | Jan 2012 | B1 |
8094401 | Peng et al. | Jan 2012 | B1 |
8116020 | Lee | Feb 2012 | B1 |
8116025 | Chan et al. | Feb 2012 | B1 |
8134793 | Vasquez et al. | Mar 2012 | B1 |
8134798 | Thelin et al. | Mar 2012 | B1 |
8139301 | Li et al. | Mar 2012 | B1 |
8139310 | Hogg | Mar 2012 | B1 |
8144419 | Liu | Mar 2012 | B1 |
8145452 | Masiewicz et al. | Mar 2012 | B1 |
8149528 | Suratman et al. | Apr 2012 | B1 |
8154812 | Boyle et al. | Apr 2012 | B1 |
8159768 | Miyamura | Apr 2012 | B1 |
8161328 | Wilshire | Apr 2012 | B1 |
8164849 | Szeremeta et al. | Apr 2012 | B1 |
8174780 | Tsai et al. | May 2012 | B1 |
8174782 | Feliss et al. | May 2012 | B2 |
8174794 | Dorius | May 2012 | B2 |
8190575 | Ong et al. | May 2012 | B1 |
8194338 | Zhang | Jun 2012 | B1 |
8194340 | Boyle et al. | Jun 2012 | B1 |
8194341 | Boyle | Jun 2012 | B1 |
8201066 | Wang | Jun 2012 | B1 |
8271692 | Dinh et al. | Sep 2012 | B1 |
8279550 | Hogg | Oct 2012 | B1 |
8281218 | Ybarra et al. | Oct 2012 | B1 |
8285923 | Stevens | Oct 2012 | B2 |
8289656 | Huber | Oct 2012 | B1 |
8305705 | Roohr | Nov 2012 | B1 |
8307156 | Codilian et al. | Nov 2012 | B1 |
8310775 | Boguslawski et al. | Nov 2012 | B1 |
8315006 | Chahwan et al. | Nov 2012 | B1 |
8316263 | Gough et al. | Nov 2012 | B1 |
8320067 | Tsai et al. | Nov 2012 | B1 |
8324974 | Bennett | Dec 2012 | B1 |
8332695 | Dalphy et al. | Dec 2012 | B2 |
8341337 | Ong et al. | Dec 2012 | B1 |
8350628 | Bennett | Jan 2013 | B1 |
8356184 | Meyer et al. | Jan 2013 | B1 |
8370683 | Ryan et al. | Feb 2013 | B1 |
8375225 | Ybarra | Feb 2013 | B1 |
8375274 | Bonke | Feb 2013 | B1 |
8380922 | DeForest et al. | Feb 2013 | B1 |
8390948 | Hogg | Mar 2013 | B2 |
8390952 | Szeremeta | Mar 2013 | B1 |
8392689 | Lott | Mar 2013 | B1 |
8407393 | Yolar et al. | Mar 2013 | B1 |
8413010 | Vasquez et al. | Apr 2013 | B1 |
8417566 | Price et al. | Apr 2013 | B2 |
8421663 | Bennett | Apr 2013 | B1 |
8422172 | Dakroub et al. | Apr 2013 | B1 |
8427771 | Tsai | Apr 2013 | B1 |
8429343 | Tsai | Apr 2013 | B1 |
8433937 | Wheelock et al. | Apr 2013 | B1 |
8433977 | Vasquez et al. | Apr 2013 | B1 |
8458526 | Dalphy et al. | Jun 2013 | B2 |
8462466 | Huber | Jun 2013 | B2 |
8467151 | Huber | Jun 2013 | B1 |
8489841 | Strecke et al. | Jul 2013 | B1 |
8493679 | Boguslawski et al. | Jul 2013 | B1 |
8498074 | Mobley et al. | Jul 2013 | B1 |
8499198 | Messenger et al. | Jul 2013 | B1 |
8512049 | Huber et al. | Aug 2013 | B1 |
8514506 | Li et al. | Aug 2013 | B1 |
8531791 | Reid et al. | Sep 2013 | B1 |
8554741 | Malina | Oct 2013 | B1 |
8560759 | Boyle et al. | Oct 2013 | B1 |
8565053 | Chung | Oct 2013 | B1 |
8576511 | Coker et al. | Nov 2013 | B1 |
8578100 | Huynh et al. | Nov 2013 | B1 |
8578242 | Burton et al. | Nov 2013 | B1 |
8589773 | Wang et al. | Nov 2013 | B1 |
8593753 | Anderson | Nov 2013 | B1 |
8595432 | Vinson et al. | Nov 2013 | B1 |
8599510 | Fallone | Dec 2013 | B1 |
8601248 | Thorsted | Dec 2013 | B2 |
8611032 | Champion et al. | Dec 2013 | B2 |
8612650 | Carrie et al. | Dec 2013 | B1 |
8612706 | Madril et al. | Dec 2013 | B1 |
8612798 | Tsai | Dec 2013 | B1 |
8619383 | Jung et al. | Dec 2013 | B1 |
8621115 | Bombet et al. | Dec 2013 | B1 |
8621133 | Boyle | Dec 2013 | B1 |
8626463 | Stevens et al. | Jan 2014 | B2 |
8630052 | Jung et al. | Jan 2014 | B1 |
8630056 | Ong | Jan 2014 | B1 |
8631188 | Heath et al. | Jan 2014 | B1 |
8634158 | Chahwan et al. | Jan 2014 | B1 |
8635412 | Wilshire | Jan 2014 | B1 |
8640007 | Schulze | Jan 2014 | B1 |
8654619 | Cheng | Feb 2014 | B1 |
8661193 | Cobos et al. | Feb 2014 | B1 |
8667248 | Neppalli | Mar 2014 | B1 |
8670205 | Malina et al. | Mar 2014 | B1 |
8683295 | Syu et al. | Mar 2014 | B1 |
8683457 | Hughes et al. | Mar 2014 | B1 |
8687306 | Coker et al. | Apr 2014 | B1 |
8693133 | Lee et al. | Apr 2014 | B1 |
8694841 | Chung et al. | Apr 2014 | B1 |
8699159 | Malina | Apr 2014 | B1 |
8699171 | Boyle | Apr 2014 | B1 |
8699172 | Gunderson et al. | Apr 2014 | B1 |
8699175 | Olds et al. | Apr 2014 | B1 |
8699185 | Teh et al. | Apr 2014 | B1 |
8700850 | Lalouette | Apr 2014 | B1 |
8743502 | Bonke et al. | Jun 2014 | B1 |
8749910 | Dang et al. | Jun 2014 | B1 |
8751699 | Tsai et al. | Jun 2014 | B1 |
8755141 | Dang | Jun 2014 | B1 |
8755143 | Wilson et al. | Jun 2014 | B2 |
8756361 | Pruett et al. | Jun 2014 | B1 |
8756382 | Carlson et al. | Jun 2014 | B1 |
8838995 | Meyer et al. | Sep 2014 | B2 |
20090113702 | Hogg | May 2009 | A1 |
20100306551 | Meyer et al. | Dec 2010 | A1 |
20110226729 | Hogg | Sep 2011 | A1 |
20120159042 | Lott et al. | Jun 2012 | A1 |
20120275050 | Wilson et al. | Nov 2012 | A1 |
20120281963 | Krapf et al. | Nov 2012 | A1 |
20120324980 | Nguyen et al. | Dec 2012 | A1 |
Entry |
---|
Ralf Brunner, U.S. Appl. No. 13/903,464, filed May 28, 2013, 22 pages. |
C. Mathrew Mate, et al., Lubricant-Induced Spacing Increases at Slider-Disk Interfaces in Disk Drives, Tribol Letter, vol. 37, 2010, pp. 581-590. |
B. Marchon, et al., “Lubricant Dynamics on a Slider: The Waterfall Effect,” Journal of Applied Physics 105, 074313-074313-5 , 2009. |
Number | Date | Country | |
---|---|---|---|
61933139 | Jan 2014 | US |