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SCSI Commands

5-8 Quantum DLT 7000 Tape System

5.1.4 DATA-Phase Command Components

Many of the SCSI commands cause data to be transferred between the initiator

and the drive. The content and characteristics of this data are command-

dependent. Table 5–5 lists the information transmitted for all of the commands.

The "Length in CDB" column of Table 5–5 identifies the Command Descriptor

Block field used by the drive to determine how much command-related data are

to be transferred. The units (bytes or logical blocks) for the different Length

fields are implied by the Length Field Name as follows:

Field Name Units Implied

Allocation Length Bytes of data the drive is allowed to send to the initiator

Parameter List Length Bytes of data the initiator has available for the drive

Transfer Length Logical number of data blocks or data bytes the initiator

wants transferred or verified

Byte Transfer Length Bytes of data the initiator wants transferred

The DATA OUT column in Table 5–5 lists the information passed to the drive

by the initiator as part of the command. The DATA IN column lists the

information sent to the initiator by the drive. Numbers in parentheses after an

item indicate the item’s length in bytes. In some cases, additional length

information is communicated during the DATA phase.

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Quantum DLT 7000 Manual Pagina 112