Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 70)

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3.2 Controlling the Format of Data on the Tape

As described in Chapter 1, the EXB-8505 reads and writes tapes in

four logical formats: 8500c, 8500, 8200c, and 8200. The EXB-8205

reads and writes tapes in two logical formats: 8200c and 8200.

You control the format of the tape by issuing a MODE SELECT (15h)

command when the tape is positioned at the logical beginning of tape

(LBOT). Keep the following rules in mind whenever you write,

append to, or read a tape. These rules are described in more detail in

the examples in Section 10.18.

The CTS allows only one format on any one tape.

Note: If you are writing in 8500c format, you can turn data

compression on and off at any point on the tape using the

MODE SELECT command.

If you are writing data, you must decide the tape’s format at

LBOT. This is because the LBOT blocks define the format for the

tape. If you do not select a format, the CTS writes in its power-on

default format.

Note: To rewrite a tape in a different format, you must

overwrite the previously written LBOT pattern by issuing

a WRITE (0Ah) or WRITE FILEMARKS (10h) command at

LBOT.

If you are appending to a previously written tape at a location

other than LBOT, the CTS automatically writes in the format of

the data already on the tape. Refer to Table 25-1 on page 25-4 for

the valid locations for appending data in the various data formats.

If you are reading a previously written tape, the CTS

automatically determines the tape’s format for you.

3-8

EXB-8205 and EXB-8505

(Standard and XL)

510503

3 Implementing CTS Operations

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Exabyte EXB-8205 Instruções de Operação Página 70

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