NAME TD_CHANGESTATE -- check if a disk is currently in a drive. FUNCTION This command checks to see if there is currently a disk in a drive. IO REQUEST INPUT io_Device preset by the call to OpenDevice() io_Unit preset by the call to OpenDevice() io_Command TD_CHANGESTATE 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 tells you whether a disk is in the drive. 0 means there is a disk, while anything else indicates there is no disk.
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