High speed searching of digital cassette
US5923490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Jul 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A searching and block access method on a digitally recorded continuous web media. The method enables a digitally recorded tape to be randomly positioned to access a specific requested data block. This method does not rely on scanning the information recorded on the tape to locate a requested data block. The tape is shuttled at high speeds to randomly requested locations. Tape positioning and control is accomplished by profiling the motion required to position the tape at the requested block relative to any current tape position. A tape directory of contents and tape position is recorded on the tape and cached within the drive controller. The cached version of the tape directory is used for random accesses. The random access ability enables the tape implementation to perform disk storage emulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.