9
■
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.
Caution:
If a removable-media SCSI device is
controlled by the host adapter BIOS as a fixed
disk, do not remove the media while the system
is running; otherwise you may lose the data! If
you need to be able to remove the media while
the drive is on, install a removable-media
device driver and set this option to Disabled.
■
Extended BIOS Translation for DOS Drives >
1GByte — This option determines whether extended
translation is available for SCSI hard disks with
capacities greater than 1 GByte.
The default setting is Enabled. Extended BIOS Transla-
tion for DOS Drives> 1 GByte 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.
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-2920C includes an extended translation
scheme. This scheme, under MS-DOS, supports
2 GByte partitions on disk drives as large as 8 GBytes.
When you partition a disk under BIOS control larger
than 1 GByte, use the MS-DOS
fdisk
utility. 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 Press
<C
trl>
<A
> f
o
r SC
SISe
lec
t (TM
) Ut
ili
ty!
message appears on your screen during system bootup. The
default setting is Enabled. If this setting is disabled,
you can still start SCSISelect by pressing
after the host adapter BIOS banner appears.
■
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.
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