Quantum DLT 2000 Handbook page 76

SCRATCH AREA
Set Write Currents
Determine optimal tape
Tension
Individually adjust Write
Current for each write gap
Leader Splice
Scratch
Area
CALIBRATION AREA
Position head in vertical
Determine optimal azimuth
position (DLT 7000)
Line up data tracks with cal
tracks for Interchange
Density Detection
Figure 7-4 DLTtape Media Format
directory, and holes to indicated beginning and end of tape. Position of
BOT hole helps drive identify cartridge type.
difference in the position of the BOT (beginning of tape) hole (see
Figure 7-4). The BOT hole is a small hole in the tape that tells the drive
that the leader has passed the read/write heads and it's now safe to start
recording. The distance from the beginning of the leader to the BOT
hole tells the tape drive what type of cartridge is loaded, the maximum
native capacity, and the length of the tape in feet.
Another small difference is that DLTtape cartridges come in four
different colors. The casing for DLTtape III cartridges is dark gray,
DLTtape IIIXT cartridges are white, DLTtape IV cartridges are black,
and the CleaningTape III cartridge is cream colored. Super DLTtape I
cartridges are black, and have a distinctive textured finish, (See Figure
7-5.) These differences make it easy for users to differentiate between
tapes, especially in a situation where there are several different mod-
els of DLTtape drives working.
A major difference among the types of DLTtape media is capacity.
The DLTtape III cartridge has a native capacity of 10GB, the
DIRECTORY AREA
Used for Fast Search
Calibration Directory
Area Area
BOT HOLE
Physical Beginning of Tape
features areas for calibration,
QUANTUM DLTtape HANDBOOK
EOT HOLE
Physical End of Tape
DATA
7.5