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SONY SDT-10000/SDT-11000 DDS Tape Drive
APPENDIX D - GLOSSARY
DAT
Digital Audio Tape
DDS
Digital Data Storage, a standard format originally developed by Sony and Hewlett-Packard
for 4mm tape used for data storage.
Device Area
The first area on the tape used by the drive for drum spin-up and testing.
Dropout
An area of tape where the signal level of the media has fallen off to a level where data recov-
ery 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 (see C1, C2 & C3 ECC)
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 SDT-10000/SDT-11000 and maintains a history of
hard (uncorrectable) 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 Sub Code areas to locate an item on the tape at a speed up to
200 times faster than normal read speed.
Summary of Contents for DDS-4
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