BAD SECTOR PROCESSING METHOD OF DISK STORAGE DEVICE, AND DISK STORAGE DEVICE

摘要

PURPOSE: To eliminate a momentary decrease in performance as much as possible by performing a specific inspection regarding a function in a standby state wherein there is no access from a host. CONSTITUTION: It is judged whether the disk storage device is in standby mode (S1) and when not, commands from the host which are generated in a specific time are executed (S2) in current execution or after the execution temporarily ends. When it is judged that the device is in standby mode, a read test by a sequential read and a write servo test conducted by positioning a head at a write position are carried out so as to search for a bad sector and a write test by data writing to a specific sector is carried out to judge abnormality of the head. Consequently, when a bad sector is found through the read test or write servo test, it is formed in a preliminary area on a disk and reassigned to an alternative sector and when an abnormality of the head is found through the write test, that is reported to a user (S3).