108 Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
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continued from previous page
[3]
Drive specific size also depends on whether cache is enabled as shown in Table 5.2.1-27 (RCD = 0)
or not (RCD = 1). See drive Product Manual under list of SCSI commands supported (Section 11.3).
The buffer capacity field specifies the total number of data bytes that are available in the disc drive’s data
buffer (see 5.1.2.3.1 and 5.1.2.3.2). This number is not reduced to reflect the allocation length nor is it re-
duced to reflect the actual number of bytes written using the Write Buffer command. Following the Read
Buffer header, the disc drive shall transfer data from its data buffer. The disc drive terminates the Data In
phase when allocation length bytes of header plus data have been transferred or when all available header
and buffer data have been transferred to the initiator, which ever is less.
[4]
See “Control Byte” paragraph 4.2.6.
[5][6]
Not implemented by drives supported by this manual. Must be zero.
5.1.3
Group 2 commands for all device types
This group consists of the following supported 10 byte commands:
5.1.3.1 Change Definition Command (40h)
5.1.3.2 Log Select Command (4Ch)
5.1.3.3 Log Sense Command (4Dh)
5.1.3.1
Change Definition command (40h)
Table 5.1.3-1. Change Definition command
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
0
1
0
0
0
0
0
0
1
Logical Unit No. [1]
Reserved
2
Reserved
Save [2]
3
RSVD
Definition Parameter [3]
4
Reserved
5
Reserved
6
Reserved
7
Reserved
8
Parameter Data Length [4]
9
Control [5]
The Change Definition command (Table 5.1.3-1) modifies the operating definition of the disc drive with re-
spect to commands from all initiators.
The drive maintains only one operating definition and it applies to
all initiators in the system.
Notes.
[1] The LUN must be zero.
[2] A save control bit (Save) of zero indicates that the disc drive shall not save the operating definition. A
Save bit of one indicates that the disc drive shall save the operating definition to non-volatile memory.
[3] The definition parameter field is defined in Table 5.1.3-2.
