Hardware And Interface; Scsi-2 Compatibility; Handling And Static-Discharge Precautions - Seagate ST3285N Product Manual

ST3655 Family SCSI Drives Product Manual, Rev. A

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 x (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.
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