Sony DDS-4 Product Description Manual page 77

6. COMMAND SPECIFICATION
Supported Parameter Codes in this page are listed below along their meanings:
Parameter Code
00Ah
00Bh
00Ch
00Dh
This information is contained within RAM in the Drive Controller. When a cassette is loaded, the contents of the
System Area are copied into this log. The log is updated as the tape is used and is copied back onto the System Area
when the cassette is unloaded (if the tape is Write enabled).
Note: The System Area only contains 'previous' and 'total' information - (when the cassette is unloaded, the 'current'
values become the System Area 'previous' values).
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 'RAW retries' to 'groups written'
and 'ECC-3 retries' to 'groups read'. 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 - 26 SONY SDT-10000/SDT-11000 DDS Tape Drive
Description
001h Current number of Groups Written
002h Current number of RAW Retries
003h Current number of Groups Read
004h Current number of ECC-3 Retries
005h Previous number of Groups Written
006h Previous number of RAW Retries
007h Previous number of Groups Read
008h Previous number of ECC-3 Retries
009h Total number of Groups Written
Total number of RAW Retries
Total number of Groups Read
Total number of ECC-3 Retries
Load Count
Table 6-18: Tape Log parameter codes
LOG SENSE
Length
3
2
3
2
3
4 (DDS-3 and DDS-4)
2
3
4 (DDS-3 and DDS-4)
2
4
3
4
3
2