Browse Prior Art Database

Dynamic Spare Sector Allocation in Hard Disk Drive

IP.com Disclosure Number: IPCOM000115504D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Fujihara, S: AUTHOR [+2]

Abstract

Disclosed is a dynamic spare sector allocation method for a Hard Disk Drive (HDD) system. In a conventional HDD system having plural disks, an amount of data area is prepared as a spare region for defective data sectors in each disk surface.

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Dynamic Spare Sector Allocation in Hard Disk Drive

      Disclosed is a dynamic spare sector allocation method for a
Hard Disk Drive (HDD) system.  In a conventional HDD system having
plural disks, an amount of data area is prepared as a spare region
for defective data sectors in each disk surface.

      Conventionally, the number of spare sectors prepared for each
disk surface is fixed, therefore, a shortage of the spare region can
occur in some disks, and a surplus of the spare region can occur in
some other disks.

      The new method of allocating the spare sectors is executed as
follows.  At first an analysis of each disk surface is executed, and
a map showing the amount of defects in each disk is produced.  Then,
according to the map, the number of spare sectors needed for each
disk is determined, then the allocation of the spare sectors can be
determined for each disk surface, then no shortage or surplus of
spare sectors can happen, and an effective usage of data area can be
achieved.