Patent Number: 6,310,741

Title: Magnetic disk apparatus with data track reassigning function

Abstract: When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track information table as a track requiring rewrite and the tracks on both sides neighboring to the track are temporarily write-inhibited. The data of the track is rewritten on another track later so as to maintain the data. By doing this, the offtrack of the recording track can be made smaller without sacrifice of the access speed and the occurrence probability of write fault can be reduced. Furthermore, the reliability of a magnetic disk apparatus can be improved.

Inventors: Nishida; Yasutaka (Kokubunji, JP), Hamaguchi; Takehiko (Fuchu, JP), Takano; Hisashi (Kodaira, JP), Ide; Hiroshi (Kodaira, JP), Sawaguchi; Hideki (La Jolla, CA), Tomiyama; Futoshi (Hachioji, JP)

Assignee: Hitachi, Ltd.

International Classification: G11B 5/596 (20060101); G11B 19/04 (20060101); G11B 005/09 (); G11B 015/04 (); G11B 005/596 ()

Expiration Date: 10/30/2018