Sony SDX-800V/R manual Appendix H Glossary

15. Appendix H

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.

Amble: A frame used to separate groups. It has a Logical Frame Number of ZERO. The Main Data Area contains only a valid header.

ANSI: American National Standards Institute, which sets standards for, amongst other things, SCSI and the safety of 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)

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

SONY AIT-3Ex drive SDX-800V series Ver.1.1 15-1