Quantum DLT-S4 Guia do Utilizador descarregar pdf (Página 36)

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Chapter 1 Introduction

Background Information About SCSI

DLT-S4 Interface Reference Guide 2

Format of data written to tape:

• Logical addressing (rather than physical addressing) is used for all

data blocks.

• Tape drives support block sizes from 4 bytes to 16,777,212 bytes.

• Fixed block sizes must be in multiple of 4 bytes.

• The DLT-S4 can read DLT-S4, SDLT 600, and SDLT 320 formatted

tapes and can write to DLT-S4 formatted tapes.

Parallel SCSI

Characteristics

The features of the DLT-S4 Parallel SCSI implementation include:

• The DLT-S4 tape drive is capable of negotiating and running at any of

the following protocols:

•Single Transition

•Dual Transition

• Information Units (Ultra 320 speeds)

• DLT-S4 tape drives support wide asynchronous and synchronous

data transfers.

• SPI-4 compliant

• Odd parity is generated and checked during all single edge

information transfer phases.

• CRC is generated and checked during all dual edge information

transfer phases.

• The DLT-S4 drive disconnects from the SCSI bus at regular intervals

during information transfer phases to allow other devices to access

the bus. These disconnects are user-configurable using the

Disconnect-Reconnect page of the

MODE SELECT command.

• The DLT-S4 tape drive does not act as an initiator on the SCSI bus.

Therefore, the drive does not:

1 Generate unsolicited traffic on the network

2 Initiate its own SCSI commands

3 Assert bus reset.

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