Method and apparatus for decoding sync marks in a disk

Details Method and apparatus for decoding sync marks in a disk Method and apparatus for decoding sync marks in a disk

2007-04-10

2007-04-10

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S051000

Reexamination Certificate

active

10901295

ABSTRACT:
In a disk drive that performs perpendicular magnetic recording, the read/write channel has a sync mark generator. The sync mark generator generates a second sync mark before the read/write channel operates to write data on a disk. The second sync mark has a bit pattern including a series of bits representing positive polarity and a series of bits representing negative polarity. The series of bits, which is longer than the other, has a bit length that is at least 50% but less than 85% of the total bit length of the second sync mark.

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patent: 5852524 (1998-12-01), Glover et al.
patent: 6009549 (1999-12-01), Bliss et al.
patent: 6603622 (2003-08-01), Christiansen et al.
patent: 10-49806 (1998-02-01), None
patent: 2001-143406 (2001-05-01), None
Austrian Search Report dated May 25, 2005 for Singapore Patent Appl. No. 200404386-5.

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