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Browse Prior Art Database

Sector Address in Gray Code Area

IP.com Disclosure Number: IPCOM000111467D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Kigami, Y: AUTHOR [+4]

Abstract

This article describes a Hard Disk Drive which has Sector Addresses in the gray code area. The Sector Address is used for error detection and some other operations which require precise positioning of the head.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Sector Address in Gray Code Area

      This article describes a Hard Disk Drive which has Sector
Addresses in the gray code area.  The Sector Address is used for
error detection and some other operations which require precise
positioning of the head.

      Fig. 1 shows the hard disk which adopts the sector servo method
for positioning the head to the targeted track.  The disk 1 has
tracks 2 and and several data areas 4 which are devided by the servo
areas 3.

      Fig. 2 describes the format of the track which consists of
several sectors 5.  One servo area and one data area form one sector
area.  In the servo area, PAD1 (6), ERASE (7), GRAY CODE 8, BURST 9,
and PAD2 10 are formed.  PAD1 and PAD2 separate a servo area and a
data area.  ERASE is used for detecting the servo area.  BURST
indicates precise head position on the track.  GRAY CODE has cylinder
address information.

      The sector address is added to the GRAY CODE to indicate the
sequential number of the sectors from the start track.