Apparatus for controlling DASD in a manner that is not synchronous with channel operation, that is, transfer of commands and data are not limited to inter-record gap periods. A device interface processor controls which recording track is accessed by the DASD with data being transferred to and from a buffer. A device track indicator designates which recording tracks the device will move to in sequence. A channel interface processor controls the movement of data from and to the buffer and channel. A channel track indicator designates the recording track sequence in which the channel interface processor will access the data to be transferred. A method of operation is disclosed for utilizing the two indicators to enable the device and channel processors to communicate with each other in case the device reads incorrect records in a multi-track read operation.