Sony SDX-800V/R User Manual
15. Appendix H
SONY AIT-3Ex drive SDX-800V series Ver.1.1
15-1
15. APPENDIX H: GLOSSARY
This glossary includes many terms that are useful when working with the SONY DDS tape drive. Not all terms are
used within this manual.
used within this manual.
Amble: A frame used to separate groups. It has a Logical Frame Number of ZERO. The Main Data Area contains
only a valid header.
only a valid header.
ANSI: American National Standards Institute, which sets standards for, amongst other things, SCSI and the safety of
electrical devices.
electrical devices.
ATF: Automatic Track Finding
Beginning Of Partition (BOP): The position at the beginning of the permissible recording region of a partition. If
only one partition is defined, this position is typically equivalent to the beginning-of-medium. (BOM)
only one partition is defined, this position is typically equivalent to the beginning-of-medium. (BOM)
Beginning Of Medium (BOM): The extreme position along the medium in the direction away from the supply reel
which can be accessed by the device.
which can be accessed by the device.
Bit Error Rate: Number of errors/Total number of bits written or read
Block Error Rate: Number of errors/Total number of blocks written or read
BOM: Beginning Of Media
BOT: Beginning Of Tape
Buffered mode: A mode of data transfer in write operations which facilitates tape streaming, as reported in the
Mode Select parameter.
Mode Select parameter.
Device Area: The first area on the tape used by the drive for drum spin-up and testing.
Drop-out: An area of tape where the signal level of the media has fallen off to a level where data recovery is no
longer possible.
longer possible.
Early Warning: A device computed position near but logically before the end-of-partition. See the REW bit in the
Mode Select Device Configuration page.
Mode Select Device Configuration page.
ECC: Error Correction Code
End Of Data (EOD): End of data in a partition a special format group written after all current user data.
End Of Medium (EOM): The extreme position along the medium in the direction away from the take-up reel which
can be accessed by the device.
can be accessed by the device.
End Of Partition (EOP): The position at the end of the permissible recording region of a partition. May be the same
as end of media.
as end of media.
EOD: End Of Data
EOM: End Of Media
EOP: End Of Partition
EOT: End Of Tape
Error Rate Log: The Error Rate Log exists in RAM in the SDX-800V and maintains a history of hard (un-correctable)
and soft (correctable by RAW or C3 ECC) errors which have occurred since the last tape load.
and soft (correctable by RAW or C3 ECC) errors which have occurred since the last tape load.
Fast Searching: The process of reading just the ID areas to locate an item on the tape at a speed up to 75 times
faster than normal read speed.
faster than normal read speed.
Fault Log: The Fault Log is stored in RAM in the SDX-800V and holds a record of Self-Test failures and all problems
which have been met during normal operation.
which have been met during normal operation.
Frame: Two adjacent tracks, one A channel and one B channel.
File-mark: A mark written by the host. It does not necessarily separate files. It is up to the host to assign a meaning
to the mark. Consist of a special recorded element within a partition, containing no user data, which provides a
segmentation scheme.
to the mark. Consist of a special recorded element within a partition, containing no user data, which provides a
segmentation scheme.