Patent ID: 7089410

Claim:
A program boot method for a hard disk controller which loads a main program to boot in order to operate a hard disk drive at a unique rotation speed and a unique recording density appropriate for realizing a performance to be achieved by that type of hard disk drive, the method comprising the steps of: increasing a rotation speed of a disk provided in said hard disk drive to a common rotation speed which adapts to all types of hard disk drives regardless of the unique rotation speed that corresponds to said that type of hard disk drive; moving a magnetic head to a system area, of said disk, in which said main program is recorded at said common rotation speed and at a common recording density which adapts to all types of hard disk drives regardless of the unique rotation speed that corresponds to said that type of hard disk drive, the magnetic head accessing data recorded on said disk; moving said magnetic head in accordance with said common recording density to read said main program from said system area, and writing said main program to a RAM provided in said hard disk controller; handing over control processing of said hard disk drive to said main program; and increasing a rotation speed of said disk from said common rotation speed to said unique rotation speed for a device to be applied to said hard disk drive in a normal operation state.