Apparatus for efficient utilization of removable data recording media
US5235695A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | May 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for efficiently utilizing data recording media performs data compression beneath the level of the host processor is disclosed. To improve the ability of a recording media to be copied without increasing host processor overhead, the control unit which sees the compressed data is checked only upon recording a predetermined amount of uncompressed data. At such time, a compression ratio is calculated for the current data set and is used to monitor the recording of the remaining data of the current data set in compressed form. When a predetermined amount of compressed data is estimated to be recorded, the predetermined amount being the minimum storage capacity of a recording media, recording begins on a new recording media. Recording media spanning is reduced by checking counters in the storage device control unit only upon completion of recording an entire data set, and then using the uncompressed size of the next data set to be recorded to determine whether or not to continue recording on the same or a new cartridge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.