Browse Prior Art Database

Low-Cost DASD 520-Byte to 512-Byte Format Conversion

IP.com Disclosure Number: IPCOM000065444D
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Peterson, RA Petz, BR [+details]

Abstract

A direct-access storage device (DASD) 520-byte to 512-byte format conversion allows a system which uses a non-standard, fixed block architecture sector size to use a low cost 512-byte DASD. A method of generating a match field provides necessary data integrity to split up data from one non-standard sector on to two distinct standard sectors, each with independent check fields. A computer system such as the IBM System/38 has a non-standard sector size of X+2n bytes, where the sector consists of 8 bytes of header data and 512 bytes of data. This contrasts to a normal sector size of 2n bytes. In the System/38, the headers and data are stored contiguously on a DASD in 520-byte sectors.