Reference Guide

Chapter 4 SCSI Commands
READ ATTRIBUTE Command (8Ch)
DLT-S4 Interface Reference Guide 249
TOTAL MBYTES WRITTEN IN CURRENT/LAST LOAD and
TOTAL MBYTES READ IN CURRENT/LAST LOAD:
Indicates the total
number of data bytes transferred to or from the medium surface, after any
data compression has been applied, during the current load if the
medium is currently loaded or the last load if the medium is currently
unloaded. The drive resets these attributes to 0 when the medium is
loaded.
These values are expressed in increments of 1,048,576 bytes; that is, a
value of 1 means 1,048,576 bytes, 2 means 2,097,152 bytes, and so forth.
MEDIUM USAGE HISTORY: Provides statistics (see figure 141) for the
entire medium. If a field is not used, it is set to 0.
Table 141 MEDIUM USAGE
HISTORY Attribute — Data
Format
Bit
7 6 5 4 3 2 1 0
Byte
0 — 5
(MSB)
Current Amount of Data Written
(LSB)
6 — 11
(MSB)
Current Write Retries Count
(LSB)
12 — 17
(MSB)
Current Amount of Data Read
(LSB)
18 — 23
(MSB)
Current Read Retries Count
(LSB)
24 — 29
(MSB)
Previous Amount of Data Written
(LSB)