Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 33)

100

101

The CTS writes an EOD mark when you press the unload button or

issue one of the following commands immediately after the CTS

completes a WRITE or WRITE FILEMARKS operation:

ERASE (19h)

LOAD/UNLOAD (1Bh)

LOCATE (2Bh) in the reverse direction

REWIND (01h)

SPACE (11h) in either direction

The EOD mark is overwritten when additional data is appended to

the last data on the tape.

Note: The EOD mark is not used for 8200 format; however, in 8200

format, the end of actual data on the tape indicates where

additional data can be appended.

Logical End of Tape (LEOT)

LEOT is determined by the number of recorded tracks that occur after

LBOT. For this purpose, lengths of erased segments are converted

into an equivalent number of tracks. The number of tracks depends

on the length of the tape. (See Appendix C for information about tape

capacities based on tape length.)

Physical End of Tape (PEOT)

PEOT is located at the point on the tape where the translucent trailer

material is attached to the media. This position is detected by an

optical sensor in the tape transport mechanism.

Data Blocks

Data is written to tape in blocks. The CTS receives “logical” blocks of

data from an initiator and writes them as “physical” blocks of data to

the tape.

Logical Blocks A logical block is a unit of data transferred from

an initiator to the CTS. Logical blocks can have fixed or

variable lengths and can range from 0 to 240 KBytes. Chapter 3

provides information about controlling the size of logical

blocks sent from an initiator to the CTS.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

1-11

1 CTS Features

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Exabyte EXB-8205 Instruções de Operação Página 33

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