Method for accessing to a rotating record medium and an access control system
US4611314A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1983 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Apr 8, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2537
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an information storage system including a rotating recording medium having a number of information tracks, a head positioning mechanism for switching access position between adjacent tracks and a plurality of buffer memories each capable of storing one track of data, an alternate record area for storing data in substitution for an error data block is provided at an end of each of the tracks of the recording medium, and if an error data block is detected by a read-after-write check of the data during the rotation of the disc after the data has been written in one of the tracks from one of the buffer memories during the previous rotation of the disc, the data from the other buffer memory is written in the adjacent track or the data is read from the adjacent track and checked during a disc rotation waiting time required before the data write operation to the alternate record area is started.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.