磁気ディスク装置におけるディフェクト処理方法

Defect processing method for magnetic disk drive

Abstract

(57)【要約】 【目的】 磁気ディスク装置のデータ読み出し速度を向 上する磁気ディスク装置のディフェクト処理方法を提供 すること。 【構成】 媒体上に欠陥が存在する場合にこの欠陥部分 に替えて媒体の他の正常部分を代替的に使用してデータ の書き込み及び読み出しを行う方式の磁気ディスク装置 において、欠陥部分の代替先からデータを読み込むと共 に当該代替先のトラックに記憶されたデータの一部乃至 全部をメモリに複写しておき、次回欠陥部分をアクセス する必要が生じた場合は、当該欠陥部分の代替先に記憶 されたデータに優先してメモリに予め複写されたデータ を読み出すこと。
PURPOSE: To improve a data read speed of a magnetic disk drive by reading out data which are previously copied to a memory preferentially to data stored at an alternation destination for a defective part on a medium when the defective part needs to be accessed. CONSTITUTION: When a list N of defective parts which are newly detected is registered in an old list K and an alternation list table is rearranged in increasing order, alternation destination addresses of NG parts are not in the increasing order on the whole. For the purpose, the alternation destination addresses in the list are also changed. Then when the head 8 of the cylinder 130 at an alternation source plural defective parts and the tracks of alternation destinations are different, data are copied to the head 3 of the cylinder 1000 at the same alternation track. Then when a next defective part needs to be accessed, the previously copied data are read out preferentially to the data stored at the alternation destination of the defective part. Therefore, the read speed can be improved. COPYRIGHT: (C)1996,JPO

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Patent Citations (2)

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    JP-H01166378-AJune 30, 1989Toshiba CorpDisk control device
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