Method for determining a data transmission mode of a hard disk drive

摘要

At the start up of a system, transfer modes an HDD supports are confirmed and the fastest mode is selected from the transfer modes that the system and the HDD support in common. A test transfer of data is performed between the HDD and a memory in the selected transfer mode. In the event of an error, the transfer mode is changed to a transfer mode which is one rank lower in transfer rate than the current mode. Changing of the transfer modes is repeated until no error to occur in the test transfer. A transfer mode in which no error occurs in the test transfer is decided as a mode to be used.