Data de-duplication for serial-access storage media
US8667235B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2010 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | Nov 24, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Data storage and retrieval methods and apparatus are provided for facilitating data de-duplication for serial-access storage media such as tape. During data storage, input data is divided into a succession of chunks and, for each chunk, a corresponding data item is written to the storage media. The data item comprises the chunk data itself where it is the first occurrence of that data, and otherwise comprises a chunk-data identifier identifying that chunk of subject data. To facilitate reconstruction of the original data on read-back from the storage media a cache (50) is used together with a database (35R), stored on the media, that includes for each duplicated chunk, the location of the corresponding chunk of subject data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.