Patent ID: 6970310

Claim:
A disk system comprising: a disk control device that transfers data received from a host device; a magnetic recording medium; a spindle motor that rotatably drives the magnetic recording medium; a magnetic head disposed opposing to the magnetic recording medium; a magnetic head control section that moves the magnetic head across the magnetic recording medium; an interface control section that controls exchanges of data with the disk control device; a read/write control section that is provided between the magnetic head control section and the interface control section, and controls reading or writing of data between the disk control device and the magnetic recording medium; a write region management unit that stores a data write region corresponding to a data write request issued by the host device; a unit operable to store a data write region through the write region management unit when a data write request is issued by the host device; a read region determination unit that, when a data read request is issued by the host device, determines whether a part of or all region to be read corresponds to the data write region that is stored by the read region management unit; a magnetic head test unit that, when the read region determination unit determines that a part of or all of the region to be read corresponds to the data write region, tests whether data was correctly recorded on the magnetic recording media upon writing the data; and a unit that, if it is determined through the magnetic head test unit that the data was correctly written on the magnetic recording media, reads the data from the magnetic recording media and transfers the data to the host device in response to the data read request from the host device, and if it is determined that the data was not written normally, reports a read failure to the host device.