User's Guide
Commands: Log Sense (4Dh) Page 63
0004 2 Not applicable (always returns 0)
0005 8 Total bytes processed (written)
0006 2 Total uncorrectable errors
8007 2 Rewrites since last read-type operation
The total rewrite count is incremented each time a frame sequence is rewritten on
tape. Rewrites are used to recover from media errors detected by the RAW (read-
after-write) checking feature of the drive.
The total errors corrected count is the same as the total rewrite count.
The total bytes written count is incremented by the size of each group (in bytes) that
is successfully written to tape. This count includes any fill bytes needed to fill a
group before the group is written to tape.
However, this count does NOT include the count of additional bytes written during
rewrites. Also, it is greater than the count of write data bytes transferred to the drive.
The total bytes written count includes a total of
• All user data
• ECC frames
• Other structures in the group data (as defined by the DDS format)
The total uncorrectable errors count is a tabulation of the times the drive could not
correct a write error by any means (including the rewrite retry limit being exceeded).
The rewrites since last read-type operation count is similar to the total rewrite count
(0002) except the counter is set to 0 in two cases:
• When the operation is changed to a read-type operation.
• When a rewind operation is performed.
Read Error Counts (page 3)
Page 3 contains the Read Error counts, which are tabulations of any errors
encountered while reading the tape. these tabulations include possible errors from
media access commands.
The page 3 parameter codes for read errors are listed in the following table.
Parameter Code Length Name
0002 2 Total rereads
0003 3 Total errors corrected
0004 2 Total correctable ECC C3 errors
0005 8 Total bytes processed (read)
0006 2 Total uncorrectable errors
8007 2 Rereads since last write-type operation
The total reread count is incremented each time the tape is repositioned to reread a
frame from the tape.