When manufacturing a disk drive, concentric servo sectors 60-6N are written to a disk 2 which define a plurality of radially-spaced, concentric servo tracks 6 as shown in the prior art disk format of
In the past, external servo writers have been used to write the concentric servo sectors 20-2N to the disk surface during manufacturing. External servo writers employ extremely accurate head positioning mechanics, such as a laser interferometer, to ensure the concentric servo sectors 20-2N are written at the proper radial location from the outer diameter of the disk to the inner diameter of the disk. However, external servo writers are expensive and require a clean room environment so that a head positioning pin can be inserted into the head disk assembly (HDA) without contaminating the disk. Thus, external servo writers have become an expensive bottleneck in the disk drive manufacturing process.
The prior art has suggested various “self-servo” writing methods wherein the internal electronics of the disk drive are used to write the concentric servo sectors independent of an external servo writer. For example, a known technique for self-servo writing a disk drive is to first write a plurality of spiral tracks to the disk, and then to servo on the spiral tracks while writing a plurality of servo sectors that define concentric servo tracks such as shown in
In one embodiment, the first spiral track 18 may be considered a “bootstrap” spiral track from which the head 20 may be servoed in order to write the second spiral track 24 which may be considered a servo spiral track. In one embodiment, the disk surface 16 may comprise a plurality of bootstrap spiral tracks which may be read in order to write a plurality of servo spiral tracks. The servo spiral tracks may then be processed in order to servo the head 20 radially over the disk surface 16 in order to write servo sectors that define concentric servo tracks. In another embodiment, the servo spiral tracks may be used as a final servo pattern for servoing the head during normal access operations without needing to write servo sectors to the disk surface.
In one embodiment, the first spiral track 18 (as well as other similar spiral tracks if needed) may be self-written to the disk surface 16 by the control circuitry 22 internal to the disk drive. An example embodiment for self-writing spiral tracks is disclosed in U.S. Pat. No. 8,634,283 entitled “DISK DRIVE PERFORMING IN-DRIVE SPIRAL TRACK WRITING” the disclosure of which is incorporated herein by reference. In another embodiment, the first spiral track 18 (e.g., bootstrap spiral track) may be written to the disk surface 16 using an external servo writer prior to installing the disk into the disk drive.
In another embodiment illustrated in
In the example of
In the embodiment of
In one embodiment, the second spiral track 24 may be demodulated by processing the read signal samples to compute a discrete Fourier transform (DFT) at the second frequency using any suitable technique. When demodulating the second spiral track 24 using a DFT, the interference from the first spiral track 18 may be attenuated when the ratio between the second frequency and the first frequency is substantially an integer plus one-half as shown in
In the embodiment of
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.
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. 14/260,503, filed on Apr. 24, 2014, entitled “DATA STORAGE DEVICE READING FIRST SPIRAL TRACK WHILE SIMULTANEOUSLY WRITING SECOND SPIRAL TRACK” to Charles A. Park et al., the disclosure of which is incorporated herein by reference.
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Number | Date | Country | |
---|---|---|---|
Parent | 14260503 | Apr 2014 | US |
Child | 14560407 | US |