Off track write protection for data storage device

Details Off track write protection for data storage device Off track write protection for data storage device

2006-08-23

2008-09-16

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

C360S031000

Reexamination Certificate

active

07426086

ABSTRACT:
Embodiments of the invention prevent offtrack write that will be caused due to a head vibration in a storage device. In one embodiment, a hard disk drive (HDD) judges approval/disapproval of write of user data to a magnetic disk by using a read signal for user data in addition to servo data in write processing. Thus, a head vibration which cannot be precisely detected based on servo data is detected to prevent off-track write. More specifically, the HDD acquires a read back signal amplitude of a read element with respect to a user data sector within adjacent servo data during a write access phase, and detects a vibration from a maximum value MAX and a minimum value MIN of the read back signal amplitude to judge data write approval/disapproval.

REFERENCES:
patent: 6046870 (2000-04-01), Karube
patent: 6327112 (2001-12-01), Ide et al.
patent: 6643084 (2003-11-01), Andrew et al.
patent: 6747833 (2004-06-01), Shimokoshi et al.
patent: 2006/0203376 (2006-09-01), Yoshioka et al.
patent: 2003-338146 (2003-11-01), None

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