You determine the presence of a disk in a drive by passing an IOExtTD to the device with TD_CHANGESTATE set in io_Command. For quick I/O, you must set io_Flags to IOF_QUICK. DiskIO->iotd_Req.io_Flags = IOF_QUICK; DiskIO->iotd_Req.io_Command = TD_CHANGESTATE; BeginIO((struct IORequest *)DiskIO); TD_CHANGESTATE returns the presence indicator of a disk in io_Actual. The value returned will be zero if a disk is currently in the drive and nonzero if the drive has no disk.
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