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Data storage device employing staggered servo wedges to increase capacity

專(zhuān)利號(hào)
US10867629B1
公開(kāi)日期
2020-12-15
申請(qǐng)人
Western Digital Technologies, Inc.(US CA San Jose)
發(fā)明人
Toshihisa Kiyonaga; Satoshi Yamamoto; Peng Huang
IPC分類(lèi)
G11B5/55
技術(shù)領(lǐng)域
servo,sectors,disk,pes,vcm,24n,in,phase,22n,offset
地域: CA CA San Jose

摘要

A data storage device is disclosed comprising a voice coil motor (VCM) having a resonance frequency, a first disk surface comprising a first set of servo sectors written at a frequency less than twice the VCM resonance frequency, and a second disk surface comprising a second set of servo sectors circumferentially offset from the first set of servo sectors and written at a frequency less than twice the VCM resonance frequency. An access of the first disk surface is performed by reading at least one of the first set of servo sectors to generate a first position error signal (PES), reading at least one of the second set of servo sectors to generate a second PES, and controlling the VCM based on the first PES and the second PES to position a first head over the first disk surface while accessing the first disk surface.

說(shuō)明書(shū)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

In the embodiment of FIGS. 2A and 2B, the first disk surface 181 is the top surface of a disk 38 and the second disk surface 182 is the bottom surface of the disk 38. The first set of servo sectors 221-22N are written to the top disk surface 181 and the second set of servo sectors 241-24N are written to the bottom disk surface 182 circumferentially offset from the first set of servo sectors 221-22N. The control circuitry 26 processes the read signals emanating from the heads to demodulate the servo sectors and generate a position error signal (PES) representing an error between the actual position of the head and a target position relative to a target track. A servo control system in the control circuitry 26 filters the PES using a suitable compensation filter to generate a control signal 40 applied to the VCM 20 which rotates an actuator arm 42 about a pivot in order to actuate the head radially over the disk in a direction that reduces the PES. The servo sectors may comprise any suitable head position information, such as a track address for coarse positioning and servo bursts for fine positioning. The servo bursts may comprise any suitable pattern, such as an amplitude based servo pattern or a phase based servo pattern (FIG. 1). In one embodiment, the first set of servo sectors 221-22N and the second set of servo sectors 241-24N are written to the disk surfaces during a servo writing procedure. The servo writing procedure may be executed by an external servo writer wherein the servo written disks are installed into production disk drives, and in another embodiment the servo writing procedure may be executed by the control circuitry 26 of each disk drive (i.e., the servo sectors may be self-servo written).

權(quán)利要求

1
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