Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 29)

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101

Single-Azimuth Compressed (8200c 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.

Three servo areas are written in each track (at the beginning,

middle, and end) to increase tracking accuracy.

Each track contains search fields for high-speed search.

By default, data is compressed. The CTS monitors the data

compression ratio and automatically turns compression off when

a data block cannot be compressed, then back on when a data

block can be compressed.

Data compression cannot be turned on and off by the user.

This track structure corresponds to 8200c logical format.

Dual-Azimuth (8500/8500c Physical Format)

The EXB-8505 reads and writes this format. In this format:

Two write heads write two tracks for each revolution of the drum.

The two write heads are mounted at different angles on the drum

so that the data in each pair of tracks is written at different

azimuths and the tracks overlap each other slightly.

In each pair of tracks, three servo areas are written at the

beginning, middle, and end of one track to increase tracking

accuracy.

Each track contains search fields for high-speed search.

Data compression can be turned on and off by the user.

This track structure corresponds to 8500 logical format when

compression is off and 8500c logical format when compression is on.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

1-7

1 CTS Features

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 445 446

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