Sony DDS-4 Product Description Manual page 164

7. DIAGNOSTICS
Group Count: This defines the number of groups to be written to or read from the tape.
0 - Write until EOT or Read until EOD/EOM
>0 - Write until count is exhausted or EOM, Read until count is exhausted or
EOD/EOM. If EOM is encountered during Write, EOD will not be written.
In all cases, encountering EOM will be recorded as a hard error.
The Diagnostic result for the Error Rate Test will be as shown in the table below.
Bit 7
Byte
0 Reset Time
Error Re-Sync
1
2 (MSB)
3
4
This test will result in a loss of logical tape position and therefore a load should be sent before the drive is used for any normal
reads or writes.
6 5 4
Reserved
Error Code
Actual Group Count
Diagnostic Test Number (02h or 03h)
Table 7-7: Error Rate Test results
3 2
Error Set
SONY SDT-10000/SDT-11000 DDS Tape Drive
1 0
(LSB)
7 - 11