The START/STOP UNIT command requests the target enable or disable the logical unit for media access operations. This command is used to eject media from the drive.

If a PREVENT MEDIUM REMOVAL command has been issued, a request to the disc should return with the sense key set to ILLEGAL REQUEST (O5h) and the additional sense code set to MEDIUM REMOVAL PREVENT (53h).

Refer to the ANSI SCSI-2 specification for a detailed description of this command.