Table of Contents
Advertisement
LOG SENSE
Total Groups Read: This is the total number of groups physically read from the tape or partition since the first time
the tape or partition was written. This does not include any reading as part of a Read-After-Write check. The number
accumulates over the life of the tape but is ZEROed by a format pass.
Total Rewritten Frames: This is the total number of frames on the tape or within the partition that were needed to be
rewritten since the tape or partition was first written. It is incremented by 1 each time a frame is repeated following
error detection by the Read-After-Write process. This count does not include any frames which are written between
the original frame and its rewrite. The number accumulates over the life of the tape but is ZEROed by a format pass.
Total 3rd ECC Count: This is the number of groups which have been physically read and data has not been
recovered without requiring the use of C3 correction since the first time the tape or partition was written. The number
accumulates over the life of the tape but is ZEROed by a format pass.
Access Count: This is the number of times the drive accesses the partition. The both an "Unload" and a "Change
Partition" is the event for incrementing the Access Count counter.
Update Replace Count: This is the number of times the drive update the partition.
Previous Rewritten Frames: This is the number of frames on the tape or within the partition that were needed to be
rewritten since the last update of the System area. It is incremented by 1 each time a frame is repeated following
error detection by the Read-After-Write process. This count does not include any frames which are written between
the original frame and its rewrite.
Previous 3rd ECC Count: This is the number of groups which have been physically read and data has not been
recovered without requiring the use of C3 correction since the last update of the System area.
Load Count: This is the number of times the tape has been loaded since the first time a tape was written. One load
consists of threading the media around the drum of the drive mechanism, positioning the tape ready for use and later
unthreading the media. The number accumulates over the life of the tape but is ZEROed by a format pass. This field
is Reserved in the System Log of Partition 0 of a multiple partitioned tape.
Last Valid Absolute Frame Number: This field shall specify the Absolute Frame Number which is the number of
Frames written since the beginning of the partition, excluding any Frames that are written in the test area. The first
Frame of the Reference area is the first Frame after the Logical Beginning-Of-Tape (LBOT) point of the current
partition and has an Absolute Frame Number of 1. Any discontinuous or repeated numbers shall occur only in an
Amble Frame sequence.
Maximum Absolute Frame Count: This field shall specify the Absolute Frame Number of the last Frame of the last
EOD Area as the Maximum Absolute Frame Number. After that, the Maximum Absolute Frame Number is equal to
the Valid Maximum Absolute Frame Number, because the whole data area in the partition contains valid data. The
Maximum Absolute Frame Number shall not be changed as long as the partition size is the same.
Partition Attributes: Both Log Sense and Log Select are available for this field. This field shall specify the attribute
of the partition as follows.
OC: (Read Only bit) If this bit indicates 1 then the Partition is still opened. This bit always managed by SDX-550V,
and cannot modify by others.
Bit
7
Byte
0
(MSB)
1
2
DU (0)
3
4
5
6
7
OC
SDX-550V shall set OC before start writing operation, and reset OC after end writing operation. In case of the
emergency like sudden power outage while writing operation, OC will be 1 even if no body perform writing now. By
this technique, SDX-550V can detect the partition have had a corruption.
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
6
5
Parameter Code (0011h)
DS (1)
TSD (0)
ETC (0)
Parameter Length (4)
0
0
4
3
TMC (00)
Reserved (00h)
Reserved (00h)
Reserved (00h)
0
6.Command Specification
2
1
0
(LSB)
Reserved
LP (0)
Reserved
6-29
Advertisement
Table of Contents
