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(multiboot.info)Data comparison technique

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Data comparison technique
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   Before activating _any_ of the device drivers, gather enough data
from similar sectors on each of the disks such that each one can be
uniquely identified.

   After activating the device drivers, compare data from the drives
using the operating system drivers. This should hopefully be sufficient
to provide such a mapping.

   Problems:

  1. The data on some BIOS devices might be identical (so the part
     reading the drives from the BIOS should have some mechanism to give
     up).

  2. There might be extra drives not accessible from the BIOS which are
     identical to some drive used by the BIOS (so it should be capable
     of giving up there as well).