Patent ID: 6950255

Claim:
A disk drive comprising: a disk medium configured to record data, wherein life time information representing a useful life time limit of the disk drive being initially recorded in a system area of the disk medium; a read/write unit configured to perform a read/write operation of data on the disk medium; a timer unit configured to generate time data synchronized with any external time; an event controller configured to, when any predetermined event occurs in the drive, record event information representing the content of the event and time data representing the event occurring time in a correspondence form; a turn-ON controller configured to measure turned-ON time data from a power ON time and store the turned-ON time data on the disk medium in the system area; and a life controller configured to read out the life time information and turned-ON time data from the system area and, based on the turned-ON time data and life time information, calculate the time data up to the life time limit of the disk drive.