Seagate STD124000N Product Manual page 110

Glossary
processed record. A sequence of codewords that results from the application of
processing to an unprocessed record.
processed record sequence. A sequence of one or more processed records that
starts on an 8-bit boundary and ends on a subsequent 8-bit boundary.
randomizing. A recoding of data symbols before they are written to tape to provide
a consistently uniform RF envelope level.
read-after-write (RAW). Reading data immediately after it is written and writing the
frame again if an error is found.
record. Related data treated as a unit of information.
reference and system area. The second section of the tape on a DAT cartridge,
which provides logs of usage and soft error occurrences.
reprocessing. The use of an algorithm to transform codewords into data as
required by the host.
separator mark. A record containing no user data, which is used to separate data.
tape drive. A peripheral storage device that records data onto removable tape
cartridges. Used to back up a disc drive. (See also disc drive.)
tape reference edge. The bottom edge of the tape when viewing the recording side
of the tape, with the PEOT to the observer's right.
timing tracking. A method of ensuring that the head is in the center of the track
that is read.
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 that is in error, without using any
error-correction techniques.
unprocessed data. Data that has not been subjected to processing.
unprocessed record. A record of unprocessed data, comprising an integral number
of bytes.
virtual end of tape (VEOT). The point along the length of the magnetic tape, within
Partition 1, that defines the end of the part of Partition 1 that is used for recording
data for interchange.
Page 98 DAT Drives