Sony SDX-700C Product Specifications Manual page 75

LOG SENSE
Parameter Code
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.
SONY AIT-3 drive SDX-700 series Ver.2.1
Table 6-21: Tape Log parameter codes
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
00Ah Total number of RAW Retries
00Bh Total number of Groups Read
00Ch Total number of ECC-3 Retries
00Dh Load Count
Description
6.Command Specification
Description
3
2
3
2
3
2
3
2
4
3
4
3
2
6-25