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Chapter 4 Theory

Track Layout

36 LTO-4 (Model B) Half-Height Tape Drive User’s Guide

A track group is a set of tracks that is recorded concurrently. The sets of

14 data tracks in a data band are data sub-bands. There are 16 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 56 track groups, 28 written in

the forward direction and 28 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 14

shows the layout of data on an LTO tape.

Figure 14 Layout of the Tracks

on LTO Ultrium Tapes

Tape edge

Even # wrap

Servo band

Odd # wrap

Tape edge

Even # wrap

Servo band

Odd # wrap

Sub-band 0

Sub-band 15

Sub-bands 1 through 14

(not shown)

Beginning of tape (BOT)

End of tape (EOT)

Data Band

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 97 98

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Quantum LTO 4 Guide de l'utilisateur Page 52