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no. Cylinders
x no. Heads
x no. Sectors
x bytes per sector
8.4 Gigabyte
Large Mode
The Large mode is the extended HDD access mode
supported by the G486-EVB system board. Some IDE
HDDs have more than 1024 cylinders without LBA
support (in some cases, you may not want the LBA
mode). The system board provides another alternative to
support these kinds of HDD.
The BIOS tells the operating system that the number of
cylinders is 1/2 of actual and that the number of heads is
double the actual. During disk access, the reverse con-
version is done by the INT13h routine.
Example of Large mode:
CYLS.
HEADS
1120
560
Maximum HDD size:
no. Cylinders
x no. Heads
x no. Sectors
x bytes per sector
1 Gigabyte
(1024)
( 255)
( 63)
( 512)
SECTORS
MODE
16
59
NORMAL
32
59
LARGE
(1024)
( 32)
( 63)
( 512)
Initial Setup Program u 3-13
G486-EVB
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