Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 191)

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Byte 01 - Page Length

The Page Length indicates the number of bytes in the Data

Compression Page that follow this byte. The valid value is 0Eh.

Byte 02, Bit 7 - DCE (Data Compression Enable)

The Data Compression Enable bit specifies whether the CTS should

enable or disable data compression. When writing data in 8500c

format with the EXB-8505, you can turn compression on or off using

the DCE bit as follows:

0 – Disable data compression.

1 – Enable data compression.

Note: The middle LED on the CTS’s front panel is amber when the

tape is in one of the compression formats (8200c or 8500c).

When the tape is in 8500c format, this LED remains amber

even if you disable compression with the DCE bit.

Important

When the CTS writes data in 8200c format, the data is always

compressed. Compression cannot be turned on or off with the

DCE bit. When you are writing in 8200c format, you must set

the DCE bit to 1. Otherwise, the CTS will return Check

Condition status and set the sense key to Illegal Request (5h).

In the MODE SENSE data, the value returned for the DCE bit

depends on the current write density of the CTS, as follows:

EXB-8505 For the EXB-8505, the DCE bit settings indicate the following:

0 – Data compression is disabled. The write density is set to 8Ch

(8500c format) and compression is turned off. Or, the write

density is set to 15h (8500 format) or 14h (8200 format).

1 – Data compression is enabled. The write density is set to 8Ch

(8500c format) and data compression is turned on. Or, the write

density is set to 90h (8200c format).

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

10-35

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

1 2 ... 186 187 188 189 190 191 192 193 194 195 196 ... 445 446

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Exabyte EXB-8205 Instruções de Operação Página 191

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