Doug Ledford wrote:
Correct, and that's what you want. The alternative is that if the BIOS can see the first disk but it's broken and can't be used, and if you have the boot sector on the second disk set to read from BIOS disk 0x81 because you ASSuMEd the first disk would be broken but still present in the BIOS tables, then your machine won't boot unless that first dead but preset disk is present. If you remove the disk entirely, thereby bumping disk 0x81 to 0x80, then you are screwed. If you have any drive failure that prevents the first disk from being recognized (blown fuse, blown electronics, etc), you are screwed until you get a new disk to replace it.
What you want is for it to use the drive number that BIOS passes into it (register DL), not a hard-coded number. That was my (only) point -- you're obviously right that hard-coding a number to 0x81 would be worse than useless.
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