发明名称 |
Using readback signals to estimate radial location on a rotating storage device |
摘要 |
Approaches for estimating the operating radius of a head in a hard-disk drive. These approaches may be used in a constant or approximately constant density servo scheme. Statistics, which describe the proportion of high frequency values to low frequency values in a readback signal read by the read/write head of a persistent storage medium, such as a hard-disk drive (HDD), are maintained. An estimated location for the read/write head using the statistics is determined. The estimated location may be expressed as an estimated operating radius, which is an estimated distance from the center of the magnetic-recording medium to a current position of the read/write head. Based on the estimated location of the read/write head, an estimated clock frequency for a readback channel to use in reading the servo data stored on the magnetic recording medium is determined. The readback channel reads the servo data using the estimated clock frequency.
|
申请公布号 |
US7961416(B2) |
申请公布日期 |
2011.06.14 |
申请号 |
US20090539087 |
申请日期 |
2009.08.11 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS, B.V. |
发明人 |
WOOD ROGER WILLIAM;COKER JONATHAN DARREL |
分类号 |
G11B5/09;G11B5/596;G11B21/02 |
主分类号 |
G11B5/09 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|