Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1996-09-13
1998-11-17
Tran, Thang V.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 7814, 360 7804, G11B 509
Patent
active
058385126
ABSTRACT:
A data reproducing apparatus for use in a hard disk drive (HDD) reproduces user data and servo data recorded on a disk. The apparatus comprises an A/D converter, a read PLL circuit, and a servo PLL circuit. The A/D converter converts signals read by a read head from the disk, to user data and servo data, both being digital data. The read PLL circuit generates sampling pulses, which are supplied to the D/A converter to reproduce the user data. The servo PLL circuit generates sampling pulses, which are supplied to the D/A converter to reproduce servo data. In the servo areas provided on the disk, the servo data is recorded, together with preamble patterns which the servo PLL circuit uses to perform phase acquisition.
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Kabushiki Kaisha Toshiba
Tran Thang V.
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