User's Guide

Page 70 DDS-4 SCSI Interface Manual, Rev. B
Name Code Length Description
Previous ECC
C3
Corrections
0008 2 This count is the number of times the drive used C3 ECC
correction to recover data from the partition during the last
cartridge usage cycle.
Total Groups
Written
0009 4 This count is the number of groups written since the partition
was formatted. This count accumulates over the life of the
cartridge but is zeroed if the tape is formatted again.
Total
Rewritten
Frames
000A 3 This count is the total number of times frames were rewritten
within the partition since the partition was formatted. It is
incremented by one each time a series of frames is rewritten
following an error detected by the RAW check. It accumulates
over the life of the cartridge but is zeroed if the tape is
formatted again.
Total Groups
Read
000B 4 This count is the number of groups read from the partition
since it was formatted. It accumulates over the life of the
cartridge but is zeroed if the tape is formatted again.
Total ECC C3
Corrections
000C 3 This count is the number of times the drive used C3 ECC
correction to recover data from the partition since the tape
was formatted. It accumulates over the life of the cartridge but
is zeroed if the tape is formatted again.
Load Count 000D 2 This count is the number of times the tape has been loaded
over the life of the tape since it was formatted. One load is the
same as a usage cycle (inserting, using, and subsequent
ejection of the cartridge). It accumulates over the life of the
cartridge but is zeroed if the tape is formatted again. In a dual-
partition tape, only one load count is maintained.
*Most significant 4 bits are 0.
Tape Capacity Page (page 31)
Page 31, the Tape Capacity page, allows you to obtain information about total and
remaining storage capacity for each partition.
Host software can use this page to determine cassette size and remaining capacity
while writing to the tape.
The Tape Capacity Page parameter codes area given in the following table.
Parameter Code Length Name
0001h 4 Remaining capacity, partition 0 (Kbytes)
0002h 4 Remaining capacity, partition 1 (Kbytes)
0003h 4 Maximum capacity, partition 0 (Kbytes)
0004h 4 Maximum capacity, partition 1 (Kbytes)
All capacities are estimates as to the maximum available user-data capacities. The
actual capacity may be slightly less because of rewrites. All values are in kilobytes.
Partition 1 is the first partition on a dual-partition tape. For single-partition tapes, only
partition 0 is used.
The remaining capacity reflects the current head position. Thus, a rewind will reset
the remaining capacity to the maximum capacity. The remaining capacity of the
partition that is not current will be the same as its maximum capacity. The maximum
capacity never changes for a particular formatted cartridge. To obtain capacity
estimates, multiply the values returned by 1,024.