TD_CHANGESTATE

check if a disk is currently in a drive.

This command checks to see if there is currently a disk in a drive.

This request is directly forwarded to the trackdisk.device.

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_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.