Disk device having a function to confirm that a selected...

Details Disk device having a function to confirm that a selected... Disk device having a function to confirm that a selected...

2006-12-26

2006-12-26

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S049000, C360S063000, C360S075000

Reexamination Certificate

active

07154688

ABSTRACT:
In a disk device in which heads are positioned by a servo mechanism, the object of the present invention is to prevent data from being destroyed by incorrect selection of a head and to improve reliability in recording or reproducing information and to prevent format efficiency from being decreased thereby.For this object, a SAM pattern in a servo information region is changed for each head and recorded. Then, the SAM pattern is read to determine which head makes access to a disk surface and the head is compared with a head to which a direction of making access is given thereby to make an error check. Moreover, by the use of a marker pattern of rotational synchronization compensating data added to the servo information, an error check of the head making access to the disc surface is conducted.

REFERENCES:
patent: 6104558 (2000-08-01), Greenberg et al.
patent: 6421194 (2002-07-01), Buch et al.
patent: 6590728 (2003-07-01), Yang
patent: 6876511 (2005-04-01), Koyanagi
patent: 5-174498 (1993-07-01), None
patent: 10-269729 (1998-10-01), None
patent: 11312372 (1999-11-01), None

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