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Multi-Sector Transfers:
LBA Mode Control:
32-bit I/O:
Transfer Mode:
30 Using the BIOS Setup Utility
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Cylinder, Head, and Sectors/Track information, as listed on the label
attached to the drive at the factory, must be entered manually on this
sub-menu using the User Type, which is described below.
Type:
Select None if there is no IDE hard disk drive for this adapter. In the case
where there is an IDE disk but the Autotype function (above) cannot be
employed, then select the User type and enter the correct drive values for
Cylinders, Heads, Sectors/Track, and Write Precomp (precompensation) for
the drive.
This field allows you to configure the System BIOS to read ahead by the
specified number of sectors whenever a disk access is performed. This has
the effect of reading more data at once to reduce the absolute number of
discrete disk reads performed by the operating system, which may increase
system performance. The possible values are: Disabled, or 2, 4, 8, or 16
sectors (default). Note that autotyping may change this value if the hard
disk reports that it supports block accesses.
When enabled, this field allows the System BIOS to reference hard disk data
as logical blocks instead of using the traditional Cylinders/Heads/Sectors
(CHS) method. The Enabled value can only be used if both the hard disk
being configured and the operating system support Logical Block
Addressing (LBA). If disabled, then CHS mode is used. Note that
autotyping may change this value if the hard disk reports that it supports
LBA. The default is Enabled.
When enabled, this field allows the System BIOS to access the hard disk
controller with 32-bit I/O accesses, increasing system performance. This
field is not affected by autotyping. The default is Disabled.
This field sets the mode that the System BIOS uses to access the hard disk.
The possible values are:
Standard
Fast PIO 1
Fast PIO 2
Fast PIO 3
Fast PIO 4 (default)
Fast DMA
Older hard disks only support the Standard setting. Newer hard disks
adhering to Fast ATA or Enhanced IDE specifications may support the
Fast PIO (programmed I/O) modes. The Fast DMA mode makes full
use of the onboard bus mastering hard disk controller and should yield the
highest performance when used in conjunction with multi-tasking operating
systems that support it. Note that autotyping may change this value
depending on the transfer modes that the hard disk reports it supports.
Chapter 3
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