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READ POSITION Command (34h) SDLT 600 SCSI Interface Guide

4-190 January 2005 81-81200-02 REV A01

4.18.1 Read Position Data — Short Form

Data returned when the service action value is 00h or 01h takes the following form:

Figure 4-100. READ POSITION (Short Form) — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 BOP EOP LOCU BYCU Rsv’d LOLU PERR Rsv’d

1 Partition Number

2 – 3 Reserved

4 – 7

(MSB)

First Logical Object Location

(LSB)

8 – 11

(MSB)

Last Logical Object Location

(LSB)

12 Reserved

13 – 15

(MSB)

Number of Logical Objects in Object Buffer

(LSB)

16 – 19

(MSB)

Number of Bytes in Object Buffer

(LSB)

Table 4-111. READ POSITION (Short Form) Data — Field Descriptions

Field Name Description

BOP Beginning of Partition. When set to 1, indicates that the drive is at the

Beginning of Partition (BOT) in the current partition. When set to 0,

indicates that the current logical position is not at BOT. Since SDLT

tape drives do not support more than one partition, the value of this bit

is 1 when at BOT.

EOP End of Partition. When set to 1, indicates that the drive is positioned

between early warning and the End of Partition (EOP) in the current

partition. When set to 0, indicates that the current logical position is

not between early warning and EOP.

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 232