Browse Prior Art Database

Disk Rotational Delay Eliminator

IP.com Disclosure Number: IPCOM000064267D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Lem, DJ [+details]

Abstract

A disk rotational delay eliminator uses after the fact logical processing to align the information, instead of waiting for the mechanical rotational alignment. This eliminates the wait time between disk accesses and frees the access arm 11 to start the next seek, after one mechanical rotation instead of one or two rotations. Two-transitions buffers 12 may be required to sustain the one mechanical rotation per track read and the transitions processor 13 must be able to derive the data from the track. This implies that: 1. The transitions and servo sync will generate transition bit sync. 2. Unique transition sequences are defined to identify control and data, e.g., home address, byte count, key field, start/ end record, start/end track, etc. 3.