SCSI Commands
Page
45
Field Descriptions
Field
Bytes
Bits
Description
Parameter
Code
0-1
Identifies the log parameter returned. Log Parameters are always
returned in ascending order.
Disable
Update
(DU)
2
7
0 = Enables update of accumulated value when the corresponding
event occurs.
1 = Disables update of all accumulated values within a log page
when the corresponding event occurs. The drive sets this bit to
indicate that the accumulated value of the parameter has
reached its maximum value so that the drive can no longer in-
crement any Parameter Values.
Disable
Save (DS)
2
6
Always 1, indicating that the drive does not support Save Page in
Log Sense and Log Select.
TSD
2
5
Always 0, indicating that Target Save Disable (TSD) is not sup-
ported.
ETC
2
4
Always 0, indicating that Enable Threshold Comparison (ETC) is not
supported.
TMC
2
2-3
Always 0, indicating that Threshold Met Criteria (TMC) is not sup-
ported.
List Binary
(LBIN)
2
1
Always 0, indicating that all log parameters are data counters.
List
Parameter
(LP)
2
0
Always 0, indicating that all log parameters are data counters.
Parameter
Length
3
n – 3, indicating the length of the Parameter Value.
Parameter
Value
4 – n
The Parameter Value is the actual data requested.
Reserved
Always 0.
Supported Log Pages Log (00h)
Page 00h indicates the log pages used by the drive. To determine the size of each
page and of each parameter in the page, the individual page must be requested.
Page 00h is unique in that the log parameters returned do not contain log parameter
headers. All other pages return a log parameter header for each log parameter. Page
00h is valid only for the Log Sense command. When page 00h is requested, the four-
byte page header is returned followed by the list of log pages—one byte for each log
page. The list of log pages is returned in ascending order.
Byte
Bits
7
6
5
4
3
2
1
0
0
Reserved
Page Code (00h)
1
Reserved
2
Page Length, MSB
3
Page Length, LSB (0Ah)
4
Supported Log Pages Log (00h)
5
Write Error Counters Log (02h)
6
Read Error Counters Log (03h)
7
Sequential Access Device Log (0Ch)
8
Tape Alert Log (2Eh)
9
Tape Usage Log (30h)
10
Tape Capacity Log (31h)
11
Data Compression Log (32h)
