cd.device/CD_CHANGESTATE

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 NAME
 CD_CHANGESTATE -- check if a "valid" disk is currently in a drive.
 FUNCTION
 This command checks to see if there is a "valid" 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 CD_CHANGESTATE
 IO REQUEST RESULT
 io_Error - 0 for success, or an error code as defined in
 <devices/cd.h>
 io_Actual - 0 means there is a disk while anything else indicates
 there is no disk.
 NOTES
 A "valid" disk is a disk with a readable table of contents.

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