Adaptec AAA-UDMA, Install Manual

Page: 61 / 66

A-5
Using BIOSSelect and Disk Utilities
BIOSSelect Settings
Bus Interface Definitions
The following settings are the BIOSSelect settings most likely to
require any modification:
■
Host Adapter ID — Sets the ID for the AAA-UDMA. The
AAA-UDMA is set to ID 7, which gives it the highest priority
on the bus. We recommend you do not change this setting.
■
Parity Checking —When set to Enabled, verifies the accuracy
of data transfer on the bus. Leave this setting Enabled unless
any device connected to the AAA-UDMA does not support
parity.
Device Configuration
To configure settings for a specific device, you must know the ID
assigned to that device (see Using the Disk Utilities on page A-4.)
■
Enable Disconnection —When set to Yes, allows the device to
disconnect from the bus (sometimes called Disconnect/Recon-
nect). Leave the setting at Yes if two or more devices are con-
nected to the AAA-UDMA. If only one device is connected,
changing the setting to No results in slightly better
performance.
■
Initiate Wide Negotiation —When set to Yes, the AAA-UDMA
attempts 16-bit data transfer (wide negotiation). When set to
No
, the AAA-UDMA uses 8-bit data transfer unless the device
requests wide negotiation.
Note: Set Initiate Wide Negotiation to No if you have an
8-bit device that hangs or exhibits other performance prob-
lems.
■
Send Start Unit Command —When set to Yes, sends the Start
Unit Command to the device at bootup.
■
Include in BIOS Scan —When set to Yes, the AAA-UDMA
BIOS includes the device as part of its BIOS scan at bootup.
Leave this setting at Yes for all hard disks that are part of an
array.