Quantum DAT 24 Drive Guia do Utilizador descarregar pdf (Página 18)

Page 6 DDS-4 SCSI Interface Manual, Rev. B

Commands

Erase Read Position

Exchange Medium* Release Unit

Initialize Element Status* Receive Diagnostic Results

Inquiry Report Density Support

Load/Unload Request Block Address

Locate Request Sense

Log Select Reserve Unit

Log Sense Rewind

Mode Select Seek Block

Mode Sense Send Diagnostic

Move Medium* Space

Prevent/Allow Media Removal Test Unit Ready

Read Verify

Read Block Limits Write

Read Data Buffer Write Data Buffer

Read Element Status* Write Filemarks

* Autoloader only commands

Messages

Abort Linked Command Complete with flag

Bus Device Reset Message Reject

Disconnect No Operation

Identify Parity Error Message

Ignore Wide Residue Save Data Pointer

Initiator Detected Error Synchronous Data Transfer Request

Linked Command Complete Wide Data Transfer Request

Vendor-unique commands

Seek Block Request Block Address

SCSI Bus Protocol

Communication on the SCSI bus occurs between a host computer's SCSI controller

and a peripheral controller. The host controller is the Initiator, and the peripheral

device is the Target.

Some SCSI bus functions are assigned to the Initiator and others to the Target. The

Initiator arbitrates (enters the Arbitration Phase of operation) for control of the SCSI

bus and enters the Selection Phase to select a specific Target such as a DAT drive.

The Target drive can request transfer of command, data, status, information, or

disconnect from the bus. While the tape drive is disconnected, the bus is free to

accomplish other tasks. While disconnected, the Target drive can process

information obtained from the bus. If the Target wants to reconnect, it arbitrates for

bus control. For example, a Target can reselect an Initiator or another Target to

continue an operation.

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Quantum DAT 24 Drive Guia do Utilizador Página 18