Adaptec 1520B - AHA Storage Controller Fast SCSI 10 MBps Installation Guide download pdf (Page 9)

AHA-1520B Installation Guide

Part Number: 511162-00, Rev. A Page 9 of 16

Print Spec Number: 495339-00

Current Date: 5/30/96

Last Modified: May 30, 1996 3:43 pm

File Location: n:\mario\1520b_ig.nec\1520b_ig.frm

ECN Date: 6/11/95

Exiting SCSISelect

To exit SCSISelect, press Esc until a message prompts you

to exit (if you changed any host adapter settings, you are

prompted to save the changes before you exit). At the

prompt, select Yes to exit, then press any key to reboot

the computer. Any changes you made in SCSISelect take

effect after the computer boots. (If you are running

SCSISelect from the floppy, be sure to eject the floppy

before you re-boot.)

Using the SCSI Disk Utilities

To access the SCSI disk utilities, select the SCSI Disk

Utilities option from the menu that appears after starting

SCSISelect. Once the option is selected, SCSISelect imme-

diately scans the SCSI bus (to determine the devices

installed) and displays a list of all SCSI IDs and the

devices assigned to each ID.

When you select a specific ID and device, a small menu

appears, displaying the options Format Disk and Verify

Disk Media.

■ Format Disk—This utility allows you to perform a

low-level format on a hard disk drive. Each hard disk

drive must be low-level formatted before you can use

your operating system’s partitioning and file prepa-

ration utilities, such as MS-DOS fdisk and format.

Most SCSI disk devices are preformatted at the fac-

tory and do not need to be formatted again. The

Adaptec Format Disk utility is compatible with the

vast majority of SCSI disk drives.

Caution: A low-level format destroys all data on

the drive. Be sure to back up your data before

performing this operation. You cannot abort a

low-level format once it is started.

■ Verify Disk Media—This utility allows you to scan

the media of a hard disk drive for defects. If the util-

ity finds bad blocks on the media, it prompts you to

reassign them; if you select yes, those blocks are no

longer used. You can press Esc at any time to abort

the utility.

SCSISelect Settings

Basic Host Adapter Settings

The following settings are the SCSISelect settings most

likely to require any modification.

■ Host Adapter Interrupt (IRQ) Channel—This option

sets the host adapter’s IRQ. Each add-in card installed

in your system, including the host adapter, must have

a unique IRQ. In Plug and Play systems, the IRQ is set

automatically. In non-Plug and Play systems you must

set the IRQ manually.

■ Host Adapter SCSI ID— This option sets the host

adapter’s SCSI ID. We recommend that you set the

host adapter to SCSI ID 7, which gives the host

adapter the highest priority on the SCSI bus.

■ SCSI Parity Checking—This option determines

whether the host adapter verifies the accuracy of data

transfer on the SCSI bus. You should disable SCSI

Parity Checking on the host adapter and all SCSI

devices if any SCSI device connected to the host

adapter does not support SCSI parity; otherwise, set it

to Enabled. Most SCSI devices do support SCSI par-

ity. If you are not sure whether a device supports

SCSI parity, consult the documentation for the device.

■ Host Adapter SCSI Termination—This option sets

termination on the host adapter. You can set it to

Enabled, Disabled, or Automatic. Automatic works

like this:

– If the host adapter detects that a cable is con-

nected to either its internal or external SCSI con-

nector, then it enables its terminators (the host

adapter is at the end of the SCSI bus).

– If the host adapter detects that a cable is con-

nected to both its internal and external SCSI con-

nector, then it disables its terminators (the host

adapter lies between the ends of the SCSI bus).

We recommend that you set the host adapter to

Automatic termination.

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Adaptec 1520B - AHA Storage Controller Fast SCSI 10 MBps Installation Guide Page 9

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