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APPENDIX A: GLOSSARY
N-Group Writing--Sometimes called multiple group writing. This technique repeats each group of data so
that there are N consecutive copies of each group on the tape.
Noise--A disturbance of the signal caused by the read channel, write channel, head/tape interaction, or
conducted or radiated sources.
Randomizing--A recoding of data symbols before they are written to tape in order to provide a consistently
unifonn RF envelope level.
Read-Arter-Write (RAW)--Reading data immediately after it is written and writing the frame again if an
error is found.
Reference
&
System Area---The second section of the tape on a DAT cassette, which provides logs of
usage and soft error occurrences.
Track--A storage channel on recording tape. For DAT, specifically a diagonally positioned area on the tape
on which a series of magnetic transitions is recorded.
Uncorrected Bit Error Rate--The probability of a bit being in error, without using any error correction
techniques.
A-3
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