Quantum TC-L53FN-AR Guía de usuario descargar pdf (Pagina 52)

Chapter 4 Theory

Recording Method

38 LTO-5 Tape Drive User’s Guide

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 80 track groups, 40 written in

the forward direction and 40 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 13

shows the layout of data on an LTO tape.

Figure 13 Layout of the Tracks

on LTO Ultrium Tapes

Recording Method

The LTO-5 Tape Drive records data using write-equalized (0,13/11) Run

Length Limited (RLL) code. RLL (0,13/11) Data bits are defined as

follows:

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 ... 95 96

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