Cylinder defect management system for data storage system
US4935825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Dec 16, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for managing data errors and media defects on magnetically and optically encoded disks. The invention is a disk controller utilizing a cylinder-based defect management system that reduces the amount of physical media space needed for bad block data replacement blocks. A unique attribute is calculated for and stored with each data block on each track that permits the controller to rapidly determine if a desired data block is in the current track. Spare blocks within a cylinder may be allocated to any track within that cylinder, permitting the system to more efficiently handle larger media or data errors than prior art devices that are limited to a particular number of spare blocks per track. When a bad data block occurs, the data from that block and all subsequent blocks is "slipped" to succeeding data blocks, thereby preserving the contiguity of the logical data structure and minimizing disk access time. No re-vectoring to replacement data blocks is done until an entire track is replaced, thereby reducing the amount of error-handling time compared to prior art techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.