User guide

68 CommPlete Series 4000 Server SBC, Model IPC-551
Award BIOS Setup
x no. of Bytes per Sector ( 512)
-
Total: 8.4 gigabytes
LARGE mode:
Some IDE HDDs contain more than 1024 cylinder without LBA support
(in some cases, users do not want LBA). The BIOS provides another
alternative to support these kinds of HDD.
CYLS HEADS SECTOR MODE 

1120 16 59 NORMAL
560 32 59 LARGE
The 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 transformation process will be made inside
INT 13h in order to access the right HDD address.
Maximum HDD size in Large Mode:
no. Cylinder (1024)
x no. Head ( 32)
x no. Sector ( 63)
x no. Per sector ( 512)
-
Total: 1 gigabyte
Note: Support of the LBA or LARGE mode of HDDs, requires some special
software. All such software packages are located in the Award HDD
Service Routine (INT 13h). If the PC is running under a Operating System
that replaces the whole INT 13h, that PC may fail to access a HDD set to
LBA or LARGE mode.