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.
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