Browse Prior Art Database

Multiple Write Inhibit for Magnetic Recording Device

IP.com Disclosure Number: IPCOM000111094D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Nakagawa, Y: AUTHOR [+2]

Abstract

Disclosed is a improved method for reading and writing operation in a hard disk drive system, in particular a method for inhibitting off-track write and read. For avoiding off-track writing and reading, such as a miss-positioning of a head, a hard disk drive system must wait certain time before a writing operation begins.

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This is the abbreviated version, containing approximately 100% of the total text.

Multiple Write Inhibit for Magnetic Recording Device

      Disclosed is a improved method for reading and writing
operation in a hard disk drive system, in particular a method for
inhibitting off-track write and read.  For avoiding off-track writing
and reading, such as a miss-positioning of a head, a hard disk drive
system must wait certain time before a writing operation begins.

      Conventionally, a hard disk drive system has adopted a criteria
that defines a period of waiting time.  For example, time "a" defines
write inhibitting time and time "b" defines skew time.  In all area
of a disk, when a writing operation is executed, these fixed waiting
time are reflected.

      In the inner region of a disk (ID-zone), the quality of a
signal is not good as that of the outer region of the disk (OD-zone),
because of differences of recording density and power of output
signals.  For compensating these differences, the subject invention
adopts small write inhibit time and large skew time in an inner
region of a disk as follows.

           Write inhibit     Skew time
 ID-zone  :  0.8 * a           1.2 * b
 OD-zone  :  1.2 * a           0.8 * b

By this invention's method, the following advantages are provided:

1.    Reduction of soft error rate.

2.    No reduction of total throughput.