Patent ID: 7120096
Filing Date: 2006-10-10
Classification: G11B

Abstract:
1. A disk apparatus that performs an information reproduction from a disk recording medium when a read command is issued, and performs an information recording to said disk recording medium when a write command is issued, comprising: a setter for setting a rotating system of said disk recording medium to a zone constant linear velocity system when a command to be occurred is said write command; a counter for counting the number of continued occurrences of said read command; and a switcher for switching the rotating system of said disk recording medium between said zone constant linear velocity system and a zone constant angular velocity system corresponding to a count value of said counter when the command to be occurred is said read command, wherein when said counter value is set to zero or when the counter is set to one and a retry flag is set indicating a previous read failure then the rotating system of said disk recording medium is set to the zone constant linear velocity system, and when said counter is set to two or higher, the rotating system of said disk recording medium is set to the zone constant angular velocity system.