Nexcom Peak 555A User Manual page 67

Peak 555A User's Guide
The maximum HDD size supported by LBA mode is 8.4 Gigabytes which is
obtained by
the following formula:
no. Cyclinder
x no. Head
x no. Sector
x bytes per sector
LARGE mode
Extended HDD access mode supported by Award Software.
Some IDE HDDs contain more than 1024 cylinder without LBA support (in
some cases, user do not want LBA). The Award BIOS provides another
alternative to support these kinds of HDD!
Example of LARGE mode:
CYLS.
1120
560
BIOS tricks DOS (or other OS) that the number of cylinders is less than
1024 by
dividing it by 2. At the same time, the number of heads is multiplied by 2.
A reverse
order to access
Maximum HDD size:
no. Cyclinder
x no. Head
x no. Sector
x bytes per sector
BIOS Setup
HEADS
16
32
transformation process will be made inside INT13h in
the right HDD address the right HDD address!
1 Gigabytes
( 1024)
( 255)
( 63)
( 512)
8.4 Gigabytes
SECTOR MODE
59 NORMAL
59 LARGE
( 1024)
( 32)
( 63)
( 512)
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