Patent ID: 6832291
Filing Date: 2004-12-14
Classification: G06F

Abstract:
A redundant array of inexpensive disks level 5 memory system, comprising:a plurality of defect-adaptive memory devices, each of said plurality of defect-adaptive memory devices having a first region for sequentially storing parity information for data recovery and a second region for storing data, with the parity information needed for data recovery being stored and sequentially arranged from a most outer cylinder on a recording medium in each corresponding one of said plurality of defect-adaptive memory devices; a plurality of caches, each of said plurality of caches being respectively coupled operatively to a corresponding single unique one of said plurality of defect-adaptive memory devices, each of said plurality of caches being adapted for storing parity information for data recovery for a corresponding single unique one of said plurality of defect-adaptive memory devices to provide one-to-one caching; and a controller operatively coupled to each defect-adaptive memory device of said plurality of defect-adaptive memory devices and to each corresponding single unique cache of said plurality of caches, said controller selectively controlling writing and reading of parity information needed for data recovery in said first region of each corresponding single unique one of said plurality of defect-adaptive memory devices, selectively obtaining parity information needed for data recovery from said first region of each corresponding single unique one of said plurality of defect-adaptive memory devices, and selectively storing parity information needed for data recovery obtained from said first region of a corresponding single unique one of said plurality of defect-adaptive memory devices in a predetermined corresponding single unique one of said plurality of caches.