3-24 Dell PowerEdge 2100/180 and 2100/200 Systems User’s Guide
You should disable the host adapter BIOS if the
peripherals 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,
software drivers are needed because the drives
are not controlled by the BIOS.
•Extended BIOS Translation for DOS Drives >1GB.
This option determines whether extended translation
is available for SCSI hard-disk drives with capacities
greater than 1 gigabyte (GB). The default setting is
Enabled.
The standard translation scheme for SCSI host
adapters provides a maximum accessible capacity of
1 GB. To support hard-disk drives larger than 1 GB,
the 78xx series host adapters include an extended
translation scheme that supports hard-disk drives as
large as 8GB under the MS-DOS operating system
with a maximum partition size of 2 GB.
Extended BIOS translation is used only with
MS-DOS 5.0 or later. It is not necessary to enable
this if you are using another operating system such
as Novell NetWare.
When you partition a hard-disk drive larger than
1GB, use the MS-DOS fdisk utility as you normally
would. Because the cylinder size increases to 8 MB
under extended translation, the partition size you
choose must be a multiple of 8 MB. If you request a
size that is not a multiple of 8 MB, fdisk rounds up
to the nearest whole multiple of 8 MB.
•Display <Ctrl><a> Message During BIOS Initializa-
tion. This option determines whether the Press
<Ctrl><a> for SCSISelect (TM) Util-
ity! message appears on your screen during system
start-up. The default setting is Enabled. If this setting
is disabled, you can still run the SCSISelect utility by
pressing <Ctrl><a> after the host adapter BIOS ban-
ner appears.
•Multiple LUN Support. This option determines
whether your system supports booting from a SCSI
device that has multiple LUNs. The default setting is
Disabled. Enable this option if your boot device has
multiple LUNs.
•BIOS Support for Bootable CD-ROM. This option
determines whether the host adapter BIOS provides
support for booting from a CD-ROM drive. The
default setting is Enabled.
•BIOS Support for INT 13 Extensions. This option
determines whether the host adapter BIOS supports
disks with more than 1024 cylinders. The default set-
ting is Enabled.
•Support for ULTRA SCSI Speed. This option deter-
mines whether the host adapter supports the fast
transfer rates (20.0 to 40.0 megabits per second
[Mbps]). The default setting is Enabled.
Starting the SCSISelect Utility
You can start the SCSISelect utility by pressing
<Ctrl><a> when the following prompt appears briefly at
boot time:
Press <Ctrl><a> for SCSISelect (TM)
Utility!
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 removable-
media device driver and set this option to
Disabled.
CAUTION: Back up your hard-disk drive
before you change the translation scheme. All
data is erased when you change from one
translation scheme to another.