170 Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
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5.2.1.12
Prevent/Allow Medium Removal Command (1Eh)
Not implemented by the disc drive. If received, the disc drive terminates with Check Condition status and set
an Illegal Request Sense Key.
5.2.2
Group 1 Commands for Direct Access Devices
The Group 1 commands that may be implemented by the disc drive are listed in Table 5.2.2-1.
See section “SCSI Interface commands supported” in the individual drive Product Manuals for complete list
of commands supported.
Table 5.2.2-1. Group 1 Commands for Direct Access Devices
Operation
Code (Hex)
Command Name
Section
25
READ CAPACITY
5.2.2.1
28
READ EXTENDED
5.2.2.2
2A
WRITE EXTENDED
5.2.2.3
2B
SEEK EXTENDED
5.2.2.4
2E
WRITE AND VERIFY
5.2.2.5
2F
VERIFY
5.2.2.6
35
SYNCHRONIZE CACHE
5.2.2.7
37
READ DEFECT DATA
5.2.2.8
3B
WRITE DATA BUFFER
5.1.2.3
3C
READ DATA BUFFER
5.1.2.4
3E
READ LONG
5.2.2.9
3F
WRITE LONG
5.2.2.10
56
RESERVE (10)
5.2.2.11
57
RELEASE (10)
5.2.2.12
55
MODE SELECT (10)
5.2.2.13
5A
MODE SENSE (10)
5.2.2.14
5.2.2.1
Read Capacity Command (25H)
Table 5.2.2-2. Read Capacity Command
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
0
0
1
0
0
1
0
1
1
Logical Unit No. [1]
RelAdr
0
0
0
0
0
0
0
[2]
2
Logical Block Address (MSB)
[3]
3
Logical Block Address
[3]
4
Logical Block Address
[3]
5
Logical Block Address (LSB)
[3]
6
0
0
0
0
0
0
0
0
7
0
0
0
0
0
0
0
0
8
0
0
0
0
0
0
0 PMI [4]
9
0
0
0
0
0
0
Flag Link [5]
The Read Capacity command (Table 5.2.2-2) provides a means for the initiator to request the capacity of the
disc drive information.
