Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 122)

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7.1 About This Command

The LOCATE command, in conjunction with the READ POSITION

(34h) command, allows you to position the tape at a specified logical

block address. During forward and backward locate operations, the

CTS moves the tape at its high-speed search speed, which is up to 75

times the nominal tape speed.

Unlike space operations, locate operations do not detect filemarks and

setmarks (8500c format only) and do not return Check Condition

status when these elements are encountered.

Using the LOCATE Command

To use the LOCATE command, follow these steps:

1. Determine the CTS’s current location by issuing a READ

POSITION command (see Chapter 15).

2. In the initiator’s memory, save the information returned for the

First Block Location field (bytes 04 through 07) of the READ

POSITION data.

3. Continue reading or writing data as required.

4. When you want to return to the previous location, issue a

LOCATE command and specify the saved address in the Block

Address field (bytes 03 through 06).

Using the LOCATE Command on Partitioned Tapes (EXB-8505) If

the tape in the EXB-8505 is formatted with two partitions, you can

use the LOCATE command to position the tape to a location

within either partition. If necessary, the LOCATE command

causes the EXB-8505 to move from the current partition to the

other partition and then to find the requested block in the new

partition. If an error occurs during this process, the tape is

returned to the previous location in the original partition. (See

Section 3.7 starting on page 3-23 for information about creating

and using partitioned tapes.)

7-2

EXB-8205 and EXB-8505

(Standard and XL)

510503

7 LOCATE (2Bh)

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 445 446

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