Method and apparatus for access control of a disk drive using extended command

摘要

There is disclosed a disk drive which uses a specific command (extended command) such as an AV command other than a usual read/write command. The preset disk drive processes a command issued from a host system as a usual read/write command, when the command is a specific command registered beforehand. Moreover, the present disk drive stops read/write access when the command is other than the usual read/write command and is an unregistered specific command.