IBM T200F manual Supported Extended Messages

Extended Messages

Table 114. Supported Extended Messages

Name	Code	Support
Synchronous Data	01h	The default mode is for the drive to never initiate a
Transfer Request		Synchronous data transfer negotiation. The initiator is
		expected to do so. Since this mode is most important at
		power-on, no SCSI method of changing this mode is
		provided. Instead, an internal method of changing this
		mode is provided (VPD or jumper setting). If the message
		is received after selection and before the Command
		phase, it then goes to the Message In phase and
		responds with a valid response to complete the
		negotiation. If the message is received at any other time, a
		Message Reject is sent in response, placing the drive data
		transfer mode for that initiator to asynchronous.
Wide Data Transfer	03h	The default mode is for the drive to never initiate a Wide
Request		data transfer negotiation. The initiator is expected to do
		so. Since this mode is most important at power-on, no
		SCSI method of changing this mode is provided. Instead,
		an internal method of changing this mode is provided
		(VPD or jumper setting). If the message is received after
		selection and before the Command phase, it then goes to
		the Message In phase and responds with a valid response
		to complete the negotiation. If the message is received at
		any other time, a Message Reject is sent in response,
		placing the Bus Width to 1 byte wide and data transfer
		mode to asynchronous for that initiator.

100Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference