Compressed data managing apparatus and method therefor to manage compressed data of a disk storage
US6745282B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2002 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Nov 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/401
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method include allocating a compressed segment representing data that is obtained by assembling pieces of the data requested to write, and compressing the assembled data to a compression sector representing a block; changing, when updating content of the compressed segment in the compression sector recorded in said disk storage device, an area storing the compressed segment corresponding to an updating target into an invalid data area; comparing a size of the invalid data area in the compression sector recorded in said disk storage device with a preset fiducial value; and reading, from the disk storage device when the size of invalid data is larger than the preset fiducial value with respect to a certain compression sector, all of the compressed segments, exclusive of the invalid data, being allocated to the certain compression sector releasing a storage area of the storage device recording the certain compression sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.