High density disk unit and disk medium

Details High density disk unit and disk medium High density disk unit and disk medium

1996-11-25

1999-05-11

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 7704, 360 7708, B07B1/28

Patent

active

059034041

ABSTRACT:
A high-density disk unit and disk medium are disclosed. Track ID information is not placed in a servo area, or if some track ID information is placed therein, a necessary minimum is placed. The servo area is thus reduced in order to improve formatting efficiency.
A data side of a disk medium is divided into a servo area and a data area in units of a sector. A track ID area in which track information is recorded is defined at the start position of the data area immediately following the servo area. A formatter circuit allows a write data modulation circuit to write track information in the track ID area during track formatting. For writing in the data area, the formatter circuit allows a read data demodulation circuit to read data from the track ID area. Track information is thus detected, and writing tracking is assured.

REFERENCES:
patent: 4511938 (1985-04-01), Betts
patent: 4825310 (1989-04-01), Song
patent: 5422760 (1995-06-01), Abbott et al.
patent: 5596460 (1997-01-01), Greenberg et al.
patent: 5623474 (1997-04-01), Oshio et al.
patent: 5715105 (1998-02-01), Katayama et al.

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