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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.
Using BIOSSelect and Disk Utilities
A-5
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