Defines the command set extensions to facilitate operation of SCSI stream devices. The objectives of the SCSI-3 Stream Commands standard (SSC) is to provide the following: a) Permit an application client to communicate over a SCSI service delivery subsystem, with a logical unit that declares itself to be a sequential access device or printer device in the device type field of the INQUIRY command response data; b) define commands unique to each type of SCSI stream device; c) define commands to manage the operation of SCSI stream devices; and d) define the differences between the types of SCSI stream devices.