BIOS
KP6-LS
Page 4-26
LBA (Logical Block Addressing) mode: A new HDD accessing method to
overcome the 528 Megabyte bottleneck. The number of cylinders, heads & sectors
shown in setup may not be the number physically contained in the HDD. During
HDD accessing, the IDE controller will transform the logical address described by
sector, head & cylinder into its own physical address inside the HDD. The maximum
HDD size supported by LBA mode is 8.4 GigaBytes which is obtained by the
following formula:
no. Cylinder
(1024)
x no. Head
( 255)
x no. Sector
( 63)
x bytes per sector
( 512)
8.4 GigaBytes
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 LARGE mode.
CYLS
HEADS
SECTOR
MODE
1120
16
59
NORMAL
560
32
59
LARGE
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 12h in order to access the right HDD address!
Maximum HDD size:
no. Cylinder
(1024)
x no. Head
( 32)
x no. Sector
( 63)
x bytes per sector
( 512)
1 GigaByte
Note: To support LBA or LARGE mode of HDDs, there must be some
software involved. All the software is located in the Award HDD Service
Routine (INT 13h). It may fail to access a HDD with LBA (LARGE) mode
selected if you are running under a Operating System which replaces the
whole INT 13h.
Содержание KP6-LS
Страница 2: ...KP6 LS ...
Страница 14: ...Introduction KP6 LS Page 1 8 Figure 5 System Block Diagram System Block Diagram ...
Страница 17: ...Installation KP6 LS Page 3 1 Section 3 INSTALLATION ...
Страница 28: ...Installation KP6 LS Page 3 12 Page Left Blank ...
Страница 56: ...BIOS KP6 LS Page 4 28 Page Left Blank ...
Страница 58: ...DMI Access KP6 LS Page 5 2 Page Left Blank ...
Страница 62: ...Appendix KP6 LS A 4 Page Left Blank ...