Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 28)

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1.2 Structure of Data on Tape

This section provides more in-depth information about the data

formats supported by the CTSs. It discusses:

The physical structure of tracks written to tape—how data tracks

are placed on the tape and how the physical track structure

corresponds to the logical data formats supported by the CTSs.

The elements of data written to the tape—the physical and logical

beginning and end of tape, the end-of-data mark, physical and

logical data blocks, filemarks, setmarks, and so forth.

Physical Track Structure

All of the logical data formats supported by the CTSs are derived

from the physical structure of the tracks written to the tape. The

EXB-8505 writes three types of physical track structures while the

EXB-8205 writes two. The physical track structures are described

below. Figure 1-2 shows the relationship between the three physical

track structures and the four logical data formats.

Single-Azimuth Uncompressed (8200 Physical Format)

Both the EXB-8505 and EXB-8205 write and read this format. In this

format:

One write head writes a single track for each revolution of the

drum.

A single servo area is written at the beginning of each track to

provide accurate tracking.

Tracks do not contain search fields for high-speed search.

Data is not compressed.

This track structure corresponds to 8200 logical format.

1-6

EXB-8205 and EXB-8505

(Standard and XL)

510503

1 CTS Features

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