Disk drives comprise a disk and a head connected to a distal end of an actuator arm which is rotated about a pivot by a voice coil motor (VCM) to position the head radially over the disk. The disk comprises a plurality of radially spaced, concentric tracks for recording user data sectors and servo sectors. The servo sectors comprise head positioning information (e.g., a track address) which is read by the head and processed by a servo control system to control the actuator arm as it seeks from track to track.
In the embodiment of
Each head (e.g., first head 181) at the distal end of the actuator arm may comprise any suitable components. In the embodiment shown in
The interval required for each head to contact the ramp 20 may be measured relative to any suitable reference point.
In one embodiment, when moving all the heads relative to a reference point on the first disk surface 161, the first disk surface 161 may comprise any suitable servo data disbursed at any suitable frequency on the first disk surface 161. For example, the first disk surface 161 may comprise multiple reference servo tracks (such as reference servo track 42 in
Any suitable contact signal may be generated in order to detect when one of the heads contacts the ramp 20. For example, in one embodiment the read signal emanating from the head may indicate when the head contacts the ramp 20. In another embodiment illustrated in
In one embodiment, the control circuitry 22 may evaluate the ramp contact signals generated by all of the heads concurrently while moving the head stack assembly toward the ramp 20 in a single pass. In alternative embodiment, the control circuitry 22 may evaluate the ramp contact signal generated by a single head which requires the head stack assembly to be moved toward the ramp in multiple passes (one pass for each head). This embodiment is understood with reference to the flow diagram of
After calibrating the repeatable seek trajectory at block 38, an index i is initialized to the first head (block 52) to select the first head to measure the first interval required to move the head from the reference point until contacting the ramp. The selected head is then moved to the reference point (block 54) and then moved toward the ramp (block 56) while measuring the ith interval until the ith head contacts the ramp (block 58). The index i is incremented (block 60) and the flow diagram repeated for the next head until an interval has been measured for each head. The relative stroke difference between the heads is then measured based on the measured intervals (block 62).
In one embodiment, while moving the heads toward the ramp 20 the control circuitry 22 may sample a contact signal generated by one or more heads as well as sample the BEMF voltage generated by the VCM. After the heads have been unloaded onto the ramp 20, the control circuitry 22 may post-process the contact sample sequence and the BEMF sample sequence in order to measure the stroke for the corresponding head. An example of this embodiment is shown in the flow diagram of
In one embodiment, the stroke difference for each head may be measured relative to the stroke of a reference head (e.g., the first head 181). For example, in one embodiment the stroke difference may be measured relative to a reference head and a target head each time the heads are moved toward the ramp. Accordingly this embodiment requires N−1 move operations in order to measure the stroke difference for N−1 target heads relative to a reference head (where N is the total number of heads).
In an embodiment that employs a touchdown sensor 48 to generate the contact signal, the touchdown sensor 48 may be damaged (e.g., due to electrical overstress) if it remains enabled while the head slides along the ramp 20 after contacting the ramp 20 during the unload operation. Accordingly, in one embodiment the touchdown sensor 48 may be disabled after contact with the ramp 20 is detected, thereby helping to prevent damage to the touchdown sensor 48. The touchdown sensor 48 may be enabled/disabled in any suitable manner, such as by enabling/disabling a bias signal (e.g., voltage or current) applied to the touchdown sensor 48.
This embodiment is understood with reference to the flow diagram of
In one embodiment, the control circuitry 22 may be configured to real-time detect one of the heads contacting the ramp based on a left peak function (LPF):
where xn represents a sample of the contact sample sequence at time n, M represents a smoothing factor, and D represents a transient exclusion offset. In one embodiment, the real-time detection of the head contacting the ramp occurs when:
LPF(N)>G2
where N represents the point of contact within the contact sample sequence and G represents a minimum jump in the contact sample sequence before and after the ramp contact.
In one embodiment, control circuitry 22 may be configured to post-time detect one of the heads contacting the ramp based on a left peak function (LPF) and a right peak function (RPF):
where xn represents a sample of the contact sample sequence at time n, and M represents a smoothing factor. In one embodiment, the post-time detection of the head contacting the ramp occurs when a difference between LPF(n) and RPF(n) reaches an extremum (minimum or maximum).
In one embodiment, at least one of the disk surfaces (e.g., the first disk surface 161) comprises a plurality of eccentric tracks due, for example, to a non-centric alignment of the disks when clamped to a spindle motor. In one embodiment, the control circuitry 22 is configured to measure a repeatable runout (RRO) of a reference track representing the eccentricity of the reference track. The RRO of the reference track is processed to servo the first head at a substantially fixed location as the disk rotates. An example of this embodiment is illustrated in
In another embodiment illustrated in
In another embodiment, the control circuitry may measure the stroke of each individual head by moving the heads toward the ramp 20 from the reference location 108 multiple times starting from different rotation angles of the disk such as shown in
Any suitable control circuitry may be employed to implement the flow diagrams in the above embodiments, such as any suitable integrated circuit or circuits. For example, the control circuitry may be implemented within a read channel integrated circuit, or in a component separate from the read channel, such as a disk controller, or certain operations described above may be performed by a read channel and others by a disk controller. In one embodiment, the read channel and disk controller are implemented as separate integrated circuits, and in an alternative embodiment they are fabricated into a single integrated circuit or system on a chip (SOC). In addition, the control circuitry may include a suitable preamp circuit implemented as a separate integrated circuit, integrated into the read channel or disk controller circuit, or integrated into a SOC.
In one embodiment, the control circuitry comprises a microprocessor executing instructions, the instructions being operable to cause the microprocessor to perform the flow diagrams described herein. The instructions may be stored in any computer-readable medium. In one embodiment, they may be stored on a non-volatile semiconductor memory external to the microprocessor, or integrated with the microprocessor in a SOC. In another embodiment, the instructions are stored on the disk and read into a volatile semiconductor memory when the disk drive is powered on. In yet another embodiment, the control circuitry comprises suitable logic circuitry, such as state machine circuitry.
In various embodiments, a disk drive may include a magnetic disk drive, an optical disk drive, etc. In addition, while the above examples concern a disk drive, the various embodiments are not limited to a disk drive and can be applied to other data storage devices and systems, such as magnetic tape drives, solid state drives, hybrid drives, etc. In addition, some embodiments may include electronic devices such as computing devices, data server devices, media content storage devices, etc. that comprise the storage media and/or control circuitry as described above.
The various features and processes described above may be used independently of one another, or may be combined in various ways. All possible combinations and subcombinations are intended to fall within the scope of this disclosure. In addition, certain method, event or process blocks may be omitted in some implementations. The methods and processes described herein are also not limited to any particular sequence, and the blocks or states relating thereto can be performed in other sequences that are appropriate. For example, described tasks or events may be performed in an order other than that specifically disclosed, or multiple may be combined in a single block or state. The example tasks or events may be performed in serial, in parallel, or in some other manner. Tasks or events may be added to or removed from the disclosed example embodiments. The example systems and components described herein may be configured differently than described. For example, elements may be added to, removed from, or rearranged compared to the disclosed example embodiments.
While certain example embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions disclosed herein. Thus, nothing in the foregoing description is intended to imply that any particular feature, characteristic, step, module, or block is necessary or indispensable. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the embodiments disclosed herein.
This application is a continuation-in-part of U.S. patent application Ser. No. 14/040,960, filed on Sep. 30, 2013, entitled “DISK DRIVE MEASURING RADIAL OFFSET BETWEEN HEADS BY DETECTING A DIFFERENCE BETWEEN RAMP CONTACT,” which is hereby incorporated by reference in its entirety.
Number | Name | Date | Kind |
---|---|---|---|
4321517 | Touchton et al. | Mar 1982 | A |
4353101 | Kawai | Oct 1982 | A |
4491885 | Morikawa | Jan 1985 | A |
4532802 | Yeack-Scranton et al. | Aug 1985 | A |
4591937 | Nakarai | May 1986 | A |
4691152 | Ell et al. | Sep 1987 | A |
4908723 | Ohyama | Mar 1990 | A |
5075805 | Peddle et al. | Dec 1991 | A |
5113296 | Kaneko | May 1992 | A |
5384675 | Crawforth et al. | Jan 1995 | A |
5455723 | Boutaghou et al. | Oct 1995 | A |
5485323 | Anderson et al. | Jan 1996 | A |
5559648 | Hunter et al. | Sep 1996 | A |
5576906 | Fisher et al. | Nov 1996 | A |
5668679 | Swearingen et al. | Sep 1997 | A |
5754353 | Behrens et al. | May 1998 | A |
5761212 | Foland, Jr. et al. | Jun 1998 | A |
5781363 | Rowan et al. | Jul 1998 | A |
5828522 | Brown et al. | Oct 1998 | A |
5831888 | Glover | Nov 1998 | A |
5973870 | Boutaghou et al. | Oct 1999 | A |
6000282 | Ku et al. | Dec 1999 | A |
6005725 | Emo | Dec 1999 | A |
6018789 | Sokolov et al. | Jan 2000 | A |
6021012 | Bang | Feb 2000 | A |
6023386 | Reed et al. | Feb 2000 | A |
6065095 | Sokolov et al. | May 2000 | A |
6078452 | Kittilson et al. | Jun 2000 | A |
6081447 | Lofgren et al. | Jun 2000 | A |
6091564 | Codilian et al. | Jul 2000 | A |
6092149 | Hicken et al. | Jul 2000 | A |
6092150 | Sokolov et al. | Jul 2000 | A |
6092412 | Flechsig 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 |
6249896 | Ho 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 |
6292318 | Hayashi | Sep 2001 | B1 |
6292912 | Cloke et al. | Sep 2001 | B1 |
6304407 | Baker et al. | Oct 2001 | B1 |
6310740 | Dunbar et al. | Oct 2001 | B1 |
6317850 | Rothberg | Nov 2001 | B1 |
6327106 | Rothberg | Dec 2001 | B1 |
6337778 | Gagne | Jan 2002 | B1 |
6369969 | Christiansen et al. | Apr 2002 | B1 |
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 |
6411453 | Chainer et al. | 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 |
6429989 | Schultz et al. | Aug 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 |
6493173 | Kim et al. | Dec 2002 | B1 |
6499083 | Hamlin | Dec 2002 | B1 |
6507450 | Elliott | Jan 2003 | B1 |
6519104 | Cloke et al. | Feb 2003 | B1 |
6519107 | Ehrlich 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 |
6549377 | Yoshida et al. | Apr 2003 | B2 |
6550021 | Dalphy et al. | Apr 2003 | B1 |
6552880 | Dunbar et al. | Apr 2003 | B1 |
6553457 | Wilkins et al. | Apr 2003 | B1 |
6563660 | Hirano et al. | May 2003 | B1 |
6578106 | Price | Jun 2003 | B1 |
6580573 | Hull et al. | Jun 2003 | B1 |
6587293 | Ding et al. | Jul 2003 | B1 |
6590732 | Kitagawa et al. | Jul 2003 | B2 |
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 |
6636377 | Yu et al. | Oct 2003 | B1 |
6639748 | Christiansen et al. | Oct 2003 | B1 |
6643088 | Kawachi | Nov 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 |
6700726 | Gillis et al. | Mar 2004 | B1 |
6704153 | Rothberg et al. | Mar 2004 | B1 |
6704156 | Baker 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 |
6721119 | Hassan et al. | Apr 2004 | B1 |
6721121 | Schreck et al. | Apr 2004 | B1 |
6724982 | Hamlin | Apr 2004 | B1 |
6725329 | Ng et al. | Apr 2004 | B1 |
6735650 | Rothberg | May 2004 | B1 |
6735693 | Hamlin | May 2004 | B1 |
6738205 | Moran et al. | May 2004 | B1 |
6744772 | Eneboe et al. | Jun 2004 | B1 |
6745283 | Dang | Jun 2004 | B1 |
6751402 | Elliott et al. | Jun 2004 | B1 |
6754027 | Hirano et al. | Jun 2004 | B2 |
6757481 | Nazarian et al. | Jun 2004 | B1 |
6771480 | Brito | Aug 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 |
6826007 | Patton, III | 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 |
6867944 | Ryan | 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 |
6902007 | Orr et al. | Jun 2005 | B1 |
6910099 | Wang et al. | Jun 2005 | B1 |
6917489 | Lee | Jul 2005 | B2 |
6920007 | Tominaga et al. | Jul 2005 | B2 |
6928470 | Hamlin | Aug 2005 | B1 |
6931439 | Hanmann et al. | Aug 2005 | B1 |
6934104 | Kupferman | Aug 2005 | B1 |
6934713 | Schwartz et al. | Aug 2005 | B2 |
6937419 | Suk 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 |
6977791 | Zhu et al. | Dec 2005 | B2 |
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 |
7019932 | Hirano et al. | Mar 2006 | B2 |
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 |
7046474 | Kuramoto et al. | May 2006 | B2 |
7046475 | Hosokawa | May 2006 | B2 |
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 |
7068459 | Cloke et al. | Jun 2006 | B1 |
7075746 | Kupferman | Jul 2006 | B1 |
7076604 | Thelin | Jul 2006 | B1 |
7082494 | Thelin et al. | Jul 2006 | B1 |
7088533 | Shepherd et al. | Aug 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 |
7113361 | Hassan | Sep 2006 | B2 |
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 |
7159299 | McMunigal et al. | Jan 2007 | B1 |
7171108 | Masters et al. | Jan 2007 | B1 |
7171110 | Wilshire | Jan 2007 | B1 |
7177111 | Gururangan et al. | Feb 2007 | B2 |
7190547 | Khurshudov et al. | Mar 2007 | B2 |
7194576 | Boyle | Mar 2007 | B1 |
7199960 | Schreck et al. | Apr 2007 | B1 |
7200698 | Rothberg | Apr 2007 | B1 |
7203019 | Liu et al. | Apr 2007 | B1 |
7205805 | Bennett | Apr 2007 | B1 |
7206497 | Boyle et al. | Apr 2007 | B1 |
7209310 | Tsai et al. | Apr 2007 | B1 |
7215496 | Kupferman et al. | May 2007 | B1 |
7215504 | Bennett | 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 |
7274527 | Calfee et al. | Sep 2007 | B2 |
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 |
7295395 | Koh et al. | Nov 2007 | B2 |
7296284 | Price et al. | Nov 2007 | B1 |
7302501 | Cain et al. | Nov 2007 | B1 |
7302579 | Cain et al. | Nov 2007 | B1 |
7317587 | Furuhashi et al. | Jan 2008 | B2 |
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 |
7391586 | Keast | Jun 2008 | B2 |
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 |
7486466 | Hara et al. | Feb 2009 | B2 |
7496493 | Stevens | Feb 2009 | B1 |
7502194 | Alexander et al. | Mar 2009 | B2 |
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 |
7599257 | Suzuki | Oct 2009 | B2 |
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 |
7827320 | Stevens | Nov 2010 | B1 |
7839588 | Dang et al. | Nov 2010 | B1 |
7843660 | Yeo | Nov 2010 | B1 |
7843662 | Weerasooriya et al. | Nov 2010 | B1 |
7852596 | Boyle et al. | Dec 2010 | B2 |
7859782 | Lee | Dec 2010 | B1 |
7869155 | Wong | Jan 2011 | B1 |
7869164 | Shin | Jan 2011 | B2 |
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 |
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 |
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 |
8300438 | Herbert | Oct 2012 | B1 |
8305705 | Roohr | Nov 2012 | B1 |
8307156 | Codilian et al. | Nov 2012 | B1 |
8310775 | Boguslawski et al. | Nov 2012 | B1 |
8315005 | Zou 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 |
8339919 | Lee | Dec 2012 | B1 |
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 |
8427770 | O'Dell 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 |
8441909 | Thayamballi et al. | May 2013 | B1 |
8456980 | Thayamballi | Jun 2013 | B1 |
8458526 | Dalphy et al. | Jun 2013 | B2 |
8462466 | Huber | Jun 2013 | B2 |
8467151 | Huber | Jun 2013 | B1 |
8483027 | Mak et al. | Jul 2013 | B1 |
8489841 | Strecke et al. | Jul 2013 | B1 |
8493679 | Boguslawski et al. | Jul 2013 | B1 |
8499198 | Messenger et al. | Jul 2013 | B1 |
8514506 | Li et al. | Aug 2013 | B1 |
8547657 | Liu | Oct 2013 | B1 |
8554741 | Malina | Oct 2013 | B1 |
8560759 | Boyle et al. | Oct 2013 | B1 |
8576509 | Hogg | Nov 2013 | B1 |
8576511 | Coker et al. | Nov 2013 | B1 |
8578100 | Huynh et al. | Nov 2013 | B1 |
8578242 | Burton et al. | Nov 2013 | B1 |
8582223 | Garani et al. | Nov 2013 | B1 |
8582231 | Kermiche et al. | Nov 2013 | B1 |
8589773 | Wang et al. | Nov 2013 | B1 |
8593753 | Anderson | Nov 2013 | B1 |
8599512 | Hogg | Dec 2013 | B2 |
8605379 | Sun | Dec 2013 | B1 |
8611031 | Tan et al. | Dec 2013 | B1 |
8611032 | Champion et al. | Dec 2013 | B2 |
8612798 | Tsai | Dec 2013 | B1 |
8619383 | Jung et al. | Dec 2013 | B1 |
8619508 | Krichevsky et al. | Dec 2013 | B1 |
8619529 | Liew et al. | Dec 2013 | B1 |
8621115 | Bombet et al. | Dec 2013 | B1 |
8621133 | Boyle | Dec 2013 | B1 |
8625224 | Lin et al. | Jan 2014 | B1 |
8625225 | Wang | Jan 2014 | B1 |
8626463 | Stevens et al. | Jan 2014 | B2 |
8630052 | Jung et al. | Jan 2014 | B1 |
8631188 | Heath et al. | Jan 2014 | B1 |
8634283 | Rigney et al. | Jan 2014 | B1 |
8635412 | Wilshire | Jan 2014 | B1 |
8661193 | Cobos et al. | Feb 2014 | B1 |
8665547 | Yeo et al. | Mar 2014 | B1 |
8667248 | Neppalli | Mar 2014 | B1 |
8670205 | Malina et al. | Mar 2014 | B1 |
8671250 | Lee | Mar 2014 | B2 |
8681442 | Hogg | Mar 2014 | B2 |
8681445 | Kermiche et al. | Mar 2014 | B1 |
8683295 | Syu et al. | Mar 2014 | B1 |
8687306 | Coker et al. | Apr 2014 | B1 |
8687307 | Patton, III | Apr 2014 | B1 |
8687313 | Selvaraj | Apr 2014 | B2 |
8693133 | Lee et al. | Apr 2014 | B1 |
8698492 | Mak et al. | Apr 2014 | B1 |
8699171 | Boyle | Apr 2014 | B1 |
8699172 | Gunderson et al. | Apr 2014 | B1 |
8711500 | Fong et al. | Apr 2014 | B1 |
8711506 | Giovenzana et al. | Apr 2014 | B1 |
8711665 | Abdul Hamid | Apr 2014 | B1 |
8717694 | Liew et al. | May 2014 | B1 |
8717695 | Lin et al. | May 2014 | B1 |
8730612 | Haralson | May 2014 | B1 |
8743502 | Bonke et al. | Jun 2014 | B1 |
8749911 | Sun et al. | Jun 2014 | B1 |
8753146 | Szeremeta et al. | Jun 2014 | B1 |
8755136 | Ng et al. | Jun 2014 | B1 |
8756361 | Carlson et al. | Jun 2014 | B1 |
8760782 | Garani et al. | Jun 2014 | B1 |
8760792 | Tam | Jun 2014 | B1 |
8769593 | Schwartz et al. | Jul 2014 | B1 |
8773793 | McFadyen | Jul 2014 | B1 |
8773802 | Anderson et al. | Jul 2014 | B1 |
8773807 | Chia et al. | Jul 2014 | B1 |
8773957 | Champion et al. | Jul 2014 | B1 |
8780470 | Wang et al. | Jul 2014 | B1 |
8782334 | Boyle et al. | Jul 2014 | B1 |
8786976 | Kang et al. | Jul 2014 | B1 |
8787125 | Lee | Jul 2014 | B1 |
8792196 | Lee | Jul 2014 | B1 |
8792200 | Tam et al. | Jul 2014 | B1 |
8797667 | Barlow et al. | Aug 2014 | B1 |
8799977 | Kapner, III et al. | Aug 2014 | B1 |
8817413 | Knigge et al. | Aug 2014 | B1 |
8817584 | Selvaraj | Aug 2014 | B1 |
8825976 | Jones | Sep 2014 | B1 |
8825977 | Syu et al. | Sep 2014 | B1 |
9064537 | Nie et al. | Jun 2015 | B1 |
20020012193 | Kobayashi | Jan 2002 | A1 |
20020071219 | Yoshida et al. | Jun 2002 | A1 |
20020181139 | Weiehelt et al. | Dec 2002 | A1 |
20040179289 | Suk et al. | Sep 2004 | A1 |
20050152060 | Gururangan et al. | Jul 2005 | A1 |
20050198656 | Yamamoto | Sep 2005 | A1 |
20050280916 | Calfee et al. | Dec 2005 | A1 |
20060005403 | Calfee et al. | Jan 2006 | A1 |
20060028933 | Liu | Feb 2006 | A1 |
20070076317 | Keast | Apr 2007 | A1 |
20070230017 | Hiller | Oct 2007 | A1 |
20070263522 | Yamamoto | Nov 2007 | A1 |
20080002274 | Allen et al. | Jan 2008 | A1 |
20080279060 | Nishi | Nov 2008 | A1 |
20080291564 | Tang et al. | Nov 2008 | A1 |
20090113702 | Hogg | May 2009 | A1 |
20100053798 | Saga | Mar 2010 | A1 |
20100306551 | Meyer et al. | Dec 2010 | A1 |
20100309574 | Bahirat et al. | Dec 2010 | A1 |
20110226729 | Hogg | Sep 2011 | A1 |
20120127614 | Arai | May 2012 | 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 |
20130286807 | Gao | Oct 2013 | A1 |
Entry |
---|
U.S. Appl. No. 11/760,601, filed Jun. 8, 2007, 24 pages. |
www.microesys.com/dataStorage/specifications.html. |
http://www.microesys.com/pdf/pa2000.pdf, “PA 2000 High Performance Positioning System for Servotrack Writers”, MicroE Systems, PA2000 Rev.S1, 2 pages. |
Notice of Allowance dated Feb. 25, 2015 from U.S. Appl. No. 14/040,960, 5 pages. |
Office Action dated Nov. 6, 2014 from U.S. Appl. No. 14/040,960, 5 pages. |
Office Action dated Aug. 7, 2014 from U.S. Appl. No. 14/040,960, 6 pages. |
Office Action dated Apr. 7, 2014 from U.S. Appl. No. 14/040,960, 5 pages. |
Number | Date | Country | |
---|---|---|---|
Parent | 14040960 | Sep 2013 | US |
Child | 14733027 | US |