发明名称 |
Magnetic recording disk and disk drive with patterned phase-type servo fields for read/write head positioning |
摘要 |
<p>A magnetic recording disk drive uses a disk having pre-patterned servo sectors extending generally radially across the data tracks. The servo sectors include at least two position error signal (PES) bursts or fields. The phases of the PES fields in the servo readback signal are demodulated to generate a PES to control the disk drive actuator for positioning the read/write heads. Each field contains generally radially directed magnetized stripes, with each stripe comprising a plurality of islands forming a zigzag pattern. The stripes have alternating polarity of magnetizations in the along-the-track direction. In one implementation there are four fields: a first pair of fields A and B wherein the zigzag pattern of the radial stripes in field A is the mirror image about a radial line of the zigzag pattern of the radial stripes in field B, and a second like pair of fields C and D, but wherein the radial stripes in fields C and D are shifted radially by one-half the island radial height from the radial stripes in fields A and B.</p> |
申请公布号 |
EP2026336(A1) |
申请公布日期 |
2009.02.18 |
申请号 |
EP20080251864 |
申请日期 |
2008.05.29 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. |
发明人 |
MOSER, MICHAEL ANTHONY;YAMAMOTO, SATOSHI |
分类号 |
G11B5/596 |
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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