BIOS Settings



This section describes most of the BIOS settings that you will 
find in a typical Pentium-class or higher PC. Some BIOS settings 
are quite universal, while others can be found on only the 
systems made with one type of BIOS or made by one manufacturer. 
This section lists the most common settings that are used in 
modern PCs, with full explanations as to what they are and how 
to set them. This includes the more common advanced settings, 
but does not attempt a "shotgun" coverage of every setting I've 
ever seen on a machine. Some are very atypical and usually not 
something you need to worry about. The less common a setting is, 
the more often it is the case that you really will want to leave 
it on its default setting anyway. Not always, but often.

By the nature of how I designed this section, it should cover 
95%+ of the settings in your BIOS that you will ever want to 
change. If you find a setting in your BIOS that isn't covered 
here, you may find it in the BIOS Survival Guide , which has a 
more complete list of the settings found on various types of PCs.

For each setting I describe the most common options and what they 
mean. In addition, I indicate which options are usually the 
default. I also describe what the implications are of using the 
different settings, and provide general recommendations on how 
to configure most of the parameters. The settings themselves are 
organized based on the names of the settings groups you will 
find in a typical BIOS setup program .

Tip: It is a good idea to "back up" (record on paper) all of your 
BIOS settings  once your PC is running and stable, and especially 
before you make any changes to them.

Tip: Reference this procedure for specific instructions on 
configuring the most important BIOS settings to safe values, to 
maximize the chances of booting a new or problematic system.

Note: Every setup program is slightly different from every other 
one. Even if two BIOSes are both on Pentium motherboards and are 
made by Award, they may have different settings. The commands as 
shown here might be different on your PC, or they might be in a 
different place. Use care when modifying these parameters, and 
refer to your motherboard manual if it is accurate.

Warning: The highly prudent will have a backup of their hard 
disk before fiddling with their BIOS settings.

Warning: Changing advanced parameters can lead to system 
instability and data loss. It is recommended that only users who 
really understand what they are doing change these settings. 
Proceed at your own risk.

Warning: If your BIOS contains a "hard disk utility" that 
includes items like setting interleave ratios, low level 
formatting , or "media analysis", do not use it on an IDE/ATA or 
SCSI drive (which includes virtually every PC hard drive made in 
at least the last 5 years). These old utilities are designed for 
the MFM and RLL drives from the 1980s and can in theory damage a 
modern drive, for which they are unnecessary. I wish they'd just 
take them out of the setup program entirely (and on many newer 
PCs they have).
