Adaptec AHA-2944UW Installation Manual Download Page 8

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■

Include in BIOS Scan

—This option determines

whether Int 13h devices (hard disk drives) attached to
the SCSI bus are recognized by the host adapter BIOS
and are installed as devices on the system without the
need for device driver software.

Advanced Host Adapter Settings

The advanced host adapter settings should not be
changed unless absolutely necessary.

■

Reset SCSI Bus at IC Initialization

—This option

allows you to enable or disable SCSI bus resets gener-
ated by the host adapter during power-on initializa-
tion and after a hard reset. The default setting is
Enabled.

■

Host Adapter BIOS

—This option enables or disables

the host adapter BIOS. The default setting is Enabled.

Note:

Several SCSISelect options are not valid

unless the host adapter BIOS is enabled. See the
table on page 5.

If you are booting from a SCSI disk drive connected
to the host adapter, the BIOS must be enabled. You
should disable the host adapter BIOS if the peripher-
als on the SCSI bus (for example, CD-ROM drives)
are all controlled by device drivers and do not need
the BIOS.

■

Support Removable Disks Under BIOS as Fixed
Disks

—This option controls which removable-media

drives are supported by the host adapter BIOS. The
default setting is Boot Only. The following choices are
available:

–

Boot Only

—Only the removable-media drive

designated as the boot device is treated as a hard
disk drive.

–

All Disks

—All removable-media drives sup-

ported by the BIOS are treated as hard disk
drives.

–

Disabled

— No removable-media drives are

treated as hard disk drives. In this situation, soft-
ware drivers are needed because the drives are
not controlled by the BIOS.

Caution:

If a removable-media SCSI device is

controlled by the host adapter BIOS, do not
remove the media while the drive is on or you
may lose data! If you want to be able to remove
media while the drive is on, install your remov-
able-media device driver and set this option to
Disabled

■

Extended BIOS Translation for DOS Drives > 1
GByte

—This option determines whether extended

translation is available for SCSI hard disks with
capacities greater than 1 GByte. The default setting is
Enabled.

Caution:

If you decide to change the translation

scheme, back up your disk drives first! All data
is erased when you change from one translation
scheme to another.

The standard translation scheme for SCSI host adapt-
ers provides a maximum accessible capacity of
1 GByte. To support disk drives larger than 1 GByte,
the AHA-2944UW includes an extended translation
scheme. This scheme supports disk drives as large as
8 GBytes under MS-DOS with a maximum partition
size of 2 GBytes.

Extended BIOS Translation is used only with
MS-DOS 5.0 or above. You do not need to enable this
option if you are using another operating system
such as NetWare, OS/2, Windows NT

™

, or UNIX.

When you partition a disk larger than 1 GByte, use
the MS-DOS

fdisk

utility as you normally would.

Because the cylinder size increases to 8 MBytes under
extended translation, the partition size you choose
must be a multiple of 8 MBytes. If you request a size
that is not a multiple of 8 MBytes,

fdisk

rounds up to

the nearest whole multiple of 8 MBytes.

■

Display <Ctrl-A> Message During BIOS Initializa-
tion

—This option determines whether the message

Press <Ctrl> <A> for SCSISelect (TM) Utility!

appears on your screen during system bootup. The
default setting is Enabled. If this setting is disabled,
you can still invoke the SCSISelect utility by pressing