Get this A+ Hardware CertiGuide for your own computer.
Click Here!
Use coupon code "SAVE50" to get it half price!

Custom Search







Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0100:  Hard Drives

Previous Topic/Section
JBOD
Previous Page
Pages in Current Topic/Section
1
Next Page
XI  Chapter 0100: Summary
Next Topic/Section

X  Overlay Software

As you saw before, the BIOS needed to know about the system. One of the factors written in the BIOS was the CHS information. The challenge arises with the fact that unless a BIOS is upgradeable, it only knows what it knows. As hard drives moved up in size, the CHS grew beyond what the BIOS knew. Either this left the user with a drive that could not be used to capacity, or it wouldn't install. The solution is to use overlay software. In simple terms, the overlay software is written to track 0, and puts on a 'game face' that the BIOS can understand. The software than does CHS translation that the drive actually understands.

The challenge with overlay software is the fact that if it gets corrupted, the drive cannot be accessed. Given this, the preferable choice is to upgrade the BIOS. If you must use overlay software, be sure to make a floppy that has the Operating System and the overlay software. At least this is a good idea if you want to see the data on that drive after the corruption of the overlay software.


Previous Topic/Section
JBOD
Previous Page
Pages in Current Topic/Section
1
Next Page
XI  Chapter 0100: Summary
Next Topic/Section

If you find CertiGuide.com useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider buying an inexpensive PDF equivalent of the CertiGuide to A+ (Core Hardware) from StudyExam4Less.com. (Use coupon code "SAVE50" to save a full 50% off the already low price!) Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004

Adapted with permission from a work created by Tcat Houser.
CertiGuide.com Version Copyright 2004 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.