Chapter 3
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LARGE mode
Some IDE HDDs contain more than 1024 cylinder without LBA support (in
some cases, users do not want LBA). The Award BIOS provides another
alternative to support these kinds of HDD.
BIOS tricks DOS (or other OS) so the number of cylinders are less than 1024 by
dividing it by 2. At the same time, the number of heads are multiplied by 2. A
reverse transformation process will be made inside INT13h in order to access the
right HDD address.
Auto detect
If using Auto detect, the BIOS will automatically detect IDE hard disk mode
and set it to one kind of HDD modes.
3.
Remark
To support LBA or LARGE mode of HDDs, there must be some software
involved which are located in Award HDD Service Routin (INT13h).It may fail
to access a HDD with LBA (LARGE) mode selected if you are running under
an Operating System which replaces the whole INT 13h.
Power - On Boot
If you have made all the changes to CMOS values and the system can not boot
with the CMOS values selected in Setup, restart the system by turning it OFF
then ON or press the “RESET” button on the system case. You may also restart
the system by simultaneously pressing < Ctrl >, < Alt > and < Del > keys.
