Product manual

2.0 Hardware and interface

The SCSI-2 interface consists of a 9-bit bidirectional bus (8 data bits and

1 parity bit) plus 9 control signals supporting multiple initiators, discon-

nect and reconnect, and self-configuring host software. Logical block

addressing is used.

The physical interface consists of single-ended drivers and receivers

using asynchronous or synchronous communication protocols that sup-

port cable lengths of up to 6 meters (3 meters for Fast SCSI) and a bus

interface transfer rate up to 5 Mbytes per second asynchronous and

10.0 Mbytes per second synchronous. The bus protocol supports multi-

ple initiators, disconnect and reconnect, additional messages, and 6-byte

and 10-byte command descriptor blocks.

2.1 SCSI-2 compatibility

The drive interface is described in the

Seagate Wren SCSI-2 Interface

Product Manual

, publication number 77765466. The drive complies with

the mandatory subset of the ANSI SCSI-2 interface. The Fast SCSI-2

interface is based on the ANSI Small Computer System Interface-2

(SCSI-2): document number ANSI X3.131-199

(X3T9.2/86-109

Rev. 10h).

2.2 Handling and static-discharge precautions

After you unpack the drive, and before you install it in a system, be careful

not to damage it through mishandling. Observe the following standard

handling and static-discharge precautions:

Caution:

• Keep the drive in its static-shielded bag until you are ready to complete

the installation. Do not attach any cables to the drive while it is in its

static-shielded bag.

• Before handling the drive, put on a grounded wrist strap, or ground

yourself frequently by touching the metal chassis of a computer that

is plugged into a grounded outlet. Wear a grounded wrist strap

throughout the entire installation procedure.

• Handle the drive by its edges or frame only.

• The drive is extremely fragile—handle it with care. Do not press down

on the drive top cover.

• Always rest the drive on a padded, antistatic surface until you mount

it in the host system.

ST3655 Family SCSI Drives Product Manual, Rev. A 13