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CBI/CGI Technical Reference
Chassis PlansC-14
Available options are:
• Boot Only - Only the removable-media drive designated as the boot device
is treated as a hard disk drive. This is the default option.
• All Disks - All removable-media drives supported by the AIC-7880 BIOS
are treated as hard drives. This setting has no effect on drives under
NetWare, because NetWare automatically supports removable-media drives
as fixed disks.
• Disabled - No removable-media drives running under DOS are treated as
hard disk drives. In this situation, driver software is needed, because the
drives are not controlled by the BIOS.
Extended BIOS Translation for DOS Drives > 1 GByte
All current versions of MS-DOS are limited to 1024 cylinders per drive. The standard
translation scheme for SCSI host adapters, using 64 heads and 32 sectors, provides a
maximum accessible capacity of 1 GByte. To support disk drives larger than 1 GByte,
the AIC-7880 BIOS includes an extended translation scheme that supports disk drives as
large as 8 GBytes under MS-DOS.
This option is not available if the Host Adapter BIOS option is set to Disabled. The
default for this option is Enabled and should not be changed. With extended translation
enabled, drives handled by the AIC-7880 BIOS use extended translation if their
formatted capacity is greater than 1 GByte, and drives smaller than 1 GByte use standard
translation.
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NOTE: If you decide to change the translation scheme, be sure to back up the disk
drives first. All data is erased when you change from one translation scheme to another.
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When you partition a disk larger than 1 GByte, use the MS-DOS fdisk utility as you
normally would. Because the cylinder size increases up to 8MB under extended trans-
lation, the partition size you choose must be a multiple of 8MB. If you request a size that
is not a multiple of 8MB, fdisk rounds up to the nearest whole multiple of 8MB.
Available options are:
Enabled
Disabled
Display <Ctrl-A> Message During BIOS Initialization
This option has no effect since the configuration utility is invoked using the cfg7880.exe
program.
Multiple LUN Support
This option allows the BIOS to support multiple logical units. Set this option to Enabled
if any devices have multiple logical units.