Digital Equipment RW504-ZA, Руководство по обслуживанию

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obtained by writing to: Global Engineering Documents, 2805 McGaw,
Irvine, CA 92714, or call: (800) 854-7179 or (714) 261-1455. Refer to
document X3.131-SCSI-2.
• Multifunction Optical Drive and Library SCSI-2 Command Reference.
This document can be obtained by ordering part number 5960-
7606 from the Sales Response Center at Hewlett-Packard. Refer to
Appendix B for order information.
• HP Technical Guide Optical Drives and Libraries, obtained by
ordering part number 5960-7605 from the Sales Response Center at
Hewlett-Packard. Refer to Appendix B for order information.
The following tables list the SCSI-2 commands numerically, by group.
Table 6–4 Group 0 Commands (6-byte command)
Code (Hex.) Name Description
00 Test Unit Ready Provides a means to check if the logical unit is
ready
01 Rezero Unit Moves the optical head to its recalibration
position
03 Request Sense Requests the detailed error information
04 Format Unit Initializes the optical disk (done only once for
unformatted, write-once disks)
07 Reassign Blocks Reassigns defective sectors
08 Read Reads data from the specified logical block
address
0A Write Writes data to the specified logical block
address
0B Seek Moves the optical head to the physical track
where the specified logical block exists
12 Inquiry Reads the information related to the controller
and the drive unit
15 Mode Select Sets optical disk, drive unit, or controller unit
parameters
16 Reserve Gains the exclusive control of a specified
logical unit
(continued on next page)
6–28 Theory of Operation