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Chapter 4 Theory
Track Layout
28 LTO-2 Half-Height Tape Drive User’s Guide
• There are 4 data bands, each of which includes 128 data tracks.
• The data bands are numbered 2,0,1,3. Data band 2 is closest to the
bottom edge of the tape.
A track group should it be: is a set of 16 data tracks that record
concurrently. The sets of 16 data tracks in a data band are data sub bands.
There are 8 data sub bands per data band. The data tracks are accessed in
a serpentine manner.
A wrap is a track group recorded in the physical forward or physical
reverse direction. The wraps are recorded in a serpentine fashion starting
in data band 0. The tape contains 64 track groups, 32 written in the
forward direction and 32 written in the reverse direction. Even-numbered
wraps are recorded in the forward direction (BOT to EOT), and odd-
numbered wraps are recorded in the reverse direction (EOT to BOT).
Figure 10
shows the layout of data on an LTO tape.
Figure 10 Layout of
Tracks on LTO Ultrium
Tapes
Tape edge
DATA
BAND
Servo band
Even # wrap
Odd # wrap
Sub band 0
Sub bands 1 through 6
(not shown)
Beginning of
tape (BOT)
End of
tape (EOT)
Sub band 7
Tape edge
Servo band
Even # wrap
Odd # wrap
0
5
0
5