Cylinder defect management system for data storage system

Details Cylinder defect management system for data storage system Cylinder defect management system for data storage system

1988-12-16

1990-06-19

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data recirculation

360 53, G11B 509

Patent

active

049358251

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.

REFERENCES:
patent: 4706136 (1987-11-01), Wentzel

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