Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 175)

As described in Table 10-9, the value reported for the Density Code

field by the MODE SENSE command depends on the most recent

activity.

If the most recent

activity was a...

...then the value reported for the Density Code is the...

... actual format of the data on

the tape (format for reading tape)

...power-on default or format set

with the most recent MODE

SELECT (format for writing tape)*

Power on

(tape not loaded)

✔

Load operation—

previously written tape

✔

Load operation—

blank tape

✔

MODE SELECT ✔

READ ✔

WRITE ✔

* The Density Code reported in these cases reflects the format set by the most recent MODE SELECT

command that set the Density Code to a non-7Fh value.

Notes:

The RTF field on the Vendor Unique Parameters Page 1 (Page

Code 20h) indicates the format of the data on the currently loaded

data cartridge. The WTF field on the same page indicates the

format that will be used when the CTS writes data. The values

returned for these fields do not depend on the last operation

performed by the CTS.

If the tape is written in an unrecognized format or if the CTS is

not ready, the Density Code returned by the CTS corresponds to

the density in which it would write if the tape were positioned at

LBOT (that is, the currently selected write density).

When the CTS appends new data to existing data, it writes the

new data in the same format as the data already on the tape. In

this case, the writing format is automatically changed to the

reading format (no user intervention is required). Once this

automatic density change has occurred, it remains in effect for all

operations on the particular tape—including the rewriting of

LBOT.

Table 10-9 Effect of various actions on the Density Code reported by MODE SENSE

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

10-19

10 MODE SELECT (15h) andMODE SENSE (1Ah)

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 445 446

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