Barracuda 18XL Product Manual, Rev. A 45
9.0 Interface requirements
9.1 General description
This section describes in essentially general terms the interface requirements supported by the Barracuda
18XL. No attempt is made to describe all of the minute details of conditions and constraints that must be con-
sidered by designers when designing a system in which this family of drives can properly operate. Seagate
declares that the drives operate in accordance with the appropriate ANSI Standards referenced in various
places herein, with exceptions as noted herein or in the Seagate SCSI Interface Product Manual, part num-
ber 75789509.
9.2 SCSI interface messages supported
Table 5 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Barracuda 18XL family drives.
Notes.
[1] Extended messages (see the SCSI Interface Product Manual, part number 75789509).
Table 5: SCSI messages supported by Barracuda 18XL family drives
Message name Message code
Supported by
Barracuda 18XL
Abort 06h Y
Abort-tag 0Dh Y
Bus device reset 0Ch Y
Clear queue 0Eh Y
Command complete 00h Y
Continue I/O process 12h Y
Disconnect 04h Y
Extended messages 01h [1] Y
Identify 80h-FFh Y
Ignore wide residue (two bytes) 23h Y
Initiate recovery 0Fh N
Initiator detected error 05h Y
Linked command complete 0Ah Y
Linked command complete with flag 0Bh Y
Message parity error 09h Y
Message reject 07h Y
Modify data pointer [1] N
No operation 08h Y
Parallel protocol request [1] Y
Queue tag messages (two bytes)
Head of queue tag 21h Y
Ordered queue tag 22h Y
Simple queue tag 20h Y
Release recovery 10h N
Restore pointers 03h Y
Save data pointer 02h Y
Synchronous data transfer req. [1] Y
Target transfer disable 13h Y
Terminate I/O process 11h N
Wide data transfer request [1] Y
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