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6.Command Specification
6.6.7. Tape Log Page (Sony Unique)
This page is a Sony unique page which provides information on the tape currently being used. This log cannot be
cleared and has the following format:
Bit
7
Byte
0
Reserved
1
2
(MSB)
3
4
(MSB)
5
6
DU (0)
7
8
3+m
This page is used to return Tape Log information to the host in a format which conforms to the LOG SENSE
command page format.
Supported Parameter Codes in this page are listed below along with their meanings:
Parameter Code
001h
002h
003h
004h
005h
006h
007h
008h
009h
00Ah
00Bh
00Ch
00Dh
This information is contained within RAM in the Drive Controller. The log is updated as the tape is used.
The term 'current' refers to information generated during the current load of the tape; 'previous' refers to information
generated during the last tape load; 'total' refers to information generated during the life of the tape since it was first
initialized including the current load.
Use: An estimate of reading and writing performance can be made by the ratios of 'Total Groups Written' to
'Rewritten Tracks' and 'Groups Read' to 'C3 ECC Count'. An indication of tape degradation can be gained by
comparing these ratios for 'current', 'previous' and 'total' entries.
Any attempt to change this page using LOG SELECT will result in a CHECK CONDITION with a Sense Key of
ILLEGAL REQUEST. The current cumulative values will be returned regardless of the Page Control field in the LOG
SENSE CDB.
6-24
Table 6-21: Tape Log Page
6
5
Page Code (30h)
DS (1)
TSD (0)
ETC (0)
Parameter Length (m)
Parameter Value
Table 6-22: Tape Log parameter codes
Current Groups Written
Current Rewritten Tracks
Current Groups Read
Current C3 ECC Count
Previous Groups Written
Previous Rewritten Tracks
Previous Groups Read
Previous C3 ECC Count
Total Groups Written
Total Rewritten Tracks
Total Groups Read
Total C3 ECC Count
Load Count
4
3
2
Reserved
Page Length (98h)
Parameter Code
TMC (00)
Description
SONY AIT-4 drive SDX-900V series Ver.2.1
LOG SENSE
1
0
(LSB)
LBIN (0)
LP (0)
Length
8
8
8
8
8
8
8
8
8
8
8
8
4
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