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Chapter 3
BIOS Configuration
The following is a brief explanation of drive specifications:
Type:
The BIOS contains a table of pre-defined drive types. Each defined
drive type has a specified number of cylinders, number of heads,
write precompensation factor, landing zone, and number of sectors.
Drives whose specifications do not accommodate any pre-defined
type are classified as type user.
Size:
Disk drive capacity (approximate). Note that this size is usually
slightly greater than the size of a formatted disk given by a disk-
checking program.
Cyls:
Number of cylinders
Head:
Number of heads
Precomp:
Write precompensation cylinder
Landz:
Landing zone
Sector:
Number of sectors
Access Mode:
Auto, Normal, large, or LBA
Drive A
Select the correct specifications for the diskette drive(s) installed in the computer.
Auto
The BIOS automatically determines the optimal mode.
Norm al
Maximum number of cylinders, heads, and sectors
supported are 1024, 16, and 63.
Large
For drives that do not support LBA and have more than
1024 cylinders.
LBA (Logical
Block
Addressing)
During drive accesses, the IDE controller transforms the
data address described by sector, head, and cylinder
number into a physical block address, significantly
improving data transfer rates. For drives w ith greater
than 1024 cylinders.
None
No diskette drive installed.
360K, 5.25"
5.25" PC-type standard drive; 360 kilobyte capacity.
1.2M, 5.25"
5.25" AT-type high-density drive; 1.2 megabyte capacity.
720K, 3.5"
3.5" double-sided drive; 720 kilobyte capacity.
1.44M, 3.5"
3.5" double-sided high-density drive; 1.44 megabyte capacity.
2.88M, 3.5"
3.5" double-sided extended capacity; 2.88 megabyte capacity.
