This function is used to perform the operations specified on the physical drive in this request. This is similar to the Category 08h commands, except that the I/O is done offset from the beginning of the physical drive instead of from the beginning of the extended volume associated with the unit number (Category 08h).

The Track Layout Table passed in the Parameter Packet is used to determine the sector number, which is passed on to the disk controller for the operation. In cases where the sectors are oddly numbered or are non-consecutive, this request breaks into n single sector operations and verifies one sector at a time. The sector table that is specified provides information that is used during the VERIFY track operation.