NAME TD_CHANGENUM -- return the current value of the disk-change counter. FUNCTION This command returns the current value of the disk-change counter (as used by the enhanced commands). The disk change counter is incremented each time a disk is inserted or removed from the trackdisk unit. IO REQUEST INPUT io_Device preset by the call to opendevice() io_Unit preset by the call to opendevice() io_Command TD_CHANGENUM io_Flags 0 or IOF_QUICK IO REQUEST RESULT io_Error - 0 for success, or an error code as defined in <devices/trackdisk.h> io_Actual - if io_Error is 0, this contains the current value of the disk-change counter.