发明名称 |
MAGNETIC RECORDING DISK AND DISK DRIVE WITH TRACK IDENTIFICATION USING PHASE-TYPE SERVO PATTERNS |
摘要 |
A magnetic recording disk drive has a disk with a head positioning servo pattern of multiple circumferentially-spaced chevron patterns of discrete patterned servo islands. The disk drive has servo electronics that decodes the chevron patterns to determine the absolute radial position of the head without the need for separate track identification fields. The chevron pattern with the smallest radial period has a radial period P1 and each of the other chevron patterns has a period which is a unique multiple of P1. In one embodiment the first chevron pattern read by the head has period P1 and each successive chevron pattern read by the head has a period that is greater than the period of the chevron pattern immediately preceding it such that the period of each chevron pattern progressively increases.
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申请公布号 |
US2011134565(A1) |
申请公布日期 |
2011.06.09 |
申请号 |
US20090634240 |
申请日期 |
2009.12.09 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. |
发明人 |
WILSON BRUCE ALEXANDER |
分类号 |
G11B5/596;G11B5/82 |
主分类号 |
G11B5/596 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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