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Browse Prior Art Database

Capability of Mirroring OS/2 HPFS386 Drives Up to Size 2 Terabytes

IP.com Disclosure Number: IPCOM000106099D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

McHam, JN: AUTHOR

Abstract

Disclosed is the IBM OS/2* Lan Server disk fault tolerance algorithm which determines cylinder, head and sector addresses for a disk up to 2 terabytes in size. (A terabyte equals 1K gigabytes.) This allows mirrored/duplexed drives to support the large disks becoming available for personal computers. Prior to this algorithm, the maximum size allowed for a disk was 1.2 gigabytes.

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

Capability of Mirroring OS/2 HPFS386 Drives Up to Size 2 Terabytes

      Disclosed is the IBM OS/2* Lan Server disk fault tolerance
algorithm which determines cylinder, head and sector addresses for a
disk up to 2 terabytes in size.  (A terabyte equals 1K gigabytes.)
This allows mirrored/duplexed drives to support the large disks
becoming available for personal computers.  Prior to this algorithm,
the maximum size allowed for a disk was 1.2 gigabytes.

      The algorithm used by OS/2 FDISKPM is now reflected in the disk
fault tolerance modules and data structures so that the maximum
number of cylinders, heads and sectors per disk partition can be up
to 64K each.  The Relative Block Address (RBA) and length information
read in from the Master Boot Record of each disk is passed to a
function which converts the RBA to the appropriate cyliner, head and
sector for each disk address.

* Trademark of IBM Corp.