Browse Prior Art Database

Method for Mapping Disk Sectors

IP.com Disclosure Number: IPCOM000038659D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31

Publishing Venue

IBM

Related People

Authors:
Smith, TA Urquhart, RJ [+details]

Abstract

A method is described for the mapping of logical sectors to physical sectors on a magnetic disk which provides for a 2/1 interleave within a block and also provides additional interblock time. With some disk adapters the best interleave factor possible is 2/1. This allows 1 sector (512 bytes) time to unload the adapter buffer and signal the adapter that the next sector can be loaded into the buffer. Four sectors are usually grouped into a single 2K block for use by the software. It is desirable from a performance viewpoint to be able to read consecutive 2K blocks. However, this is a tight constraint since additional processing, within the same 1 sector gap, is required to complete the first 2K block and then signal the adapter that another 2K block is required.