Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
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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Austrian Search Report dated May 25, 2005 for Singapore Patent Appl. No. 200404386-5.
Sakai Yuji
Shimomura Kazuhito
Kabushiki Kaisha Toshiba
Kapadia Varsha A.
Pillsbury Winthrop Shaw & Pittman LLP
Wellington Andrea
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