ICS SB686P Series, Product Manual

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Manual Number: 40110-005-2 Page 51
Use the arrow keys or tab key to move between fields. Once you have placed the cursor in a field,
type in the correct value.
The following explains the drive parameters which you must enter for a drive type which is not in
the list:
Type is the numeric designation for a drive with certain identification parameters.
Cylinders (Cyln) is the number of disk cylinders found in the specified drive type.
Heads (Head) is the number of disk heads found in the specified drive type.
Write Precompensation (WPcom) is the read delay circuitry which takes into account the
timing differences between the inner and outer edges of the surface of the disk. The size of the
sector gets progressively smaller as the track diameter diminishes. Yet each sector must still hold
512 bytes. Write precompensation circuitry on the hard disk compensates for the physical
difference in sector size by boosting the write current for sectors on inner tracks. This parameter
designates the track (cylinder) number where write precompensation begins.
Sectors (Sec) designates the number of disk sectors per track.
Size is the formatted capacity of the drive (in megabytes) based on the following formula:
# of heads x # of cylinders x # of sects/cyln x 512 bytes/sect
IDE Drive Type Setup Options
For each of the four hard disk drives which is an IDE drive, the following options are also available
for the drive:
Logical Block Addressing (LBA) Mode
This option allows you to enable IDE LBA (Logical Block Addressing) Mode for the specified
primary or secondary IDE drive. Data is accessed by block addresses rather than by the traditional
cylinder-head-sector format. This allows you to use drives larger than 528MB. In LBA mode, the
maximum drive capacity supported is 8.4GB (gigabytes).
If LBA Mode is set to On and is supported by the hard disk drive, and if the drive is formatted,
AMIBIOS enables LBA mode and translates the physical parameters of the drive to logical param-
eters. If a hard disk drive which supports LBA mode and has a capacity greater than 528MB was
formatted with LBA mode disabled, AMIBIOS does not enable LBA mode even if the LBA Mode
parameter is set to On in Standard CMOS Setup.
If LBA Mode is set to Off, AMIBIOS uses the physical parameters of the hard disk and does not
translate parameters. The operating system which uses the parameter table then sees only 528MB
of hard disk space even if the drive contains more than 528MB.
Available options are:
Off
On