Apparatus and method for efficient organization of compressed data on a hard disk utilizing an estimated compression factor
US5237675A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1992 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Mar 19, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An embedded controller disk-drive system including a microprocessor features writing and reading of compressed/decompressed data having an arbitrary length to a rigid disk drive in an efficient manner which is transparent to a host of the disk-drive system. A compression factor relating a size of a logical block to the number of bytes stored in a physical sector on the rigid disk is selected and stored in the microprocessor. The data string is compressed, whereupon the microprocessor generates a specialized table containing descriptor field information for each logical block. The descriptor field contains information on a physical block address corresponding to the location of the compressed data string, the length of the compressed data string, and also, for overflow data, linking sector information for linking the compressed data string between two or more physical blocks on the rigid disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.