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Date: Wed, 5 Nov 1997 14:53:15 -0600 (CST)
From: Geoff Mohler <gemohler@tgn2.tgn.net>
To: current@FreeBSD.ORG
Subject: Drive Mapping problem
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Hello:

Here is the basic setup that I have here:
Tyan S1680S Tahoe, Pentium II 266, 128MB
Adaptec 2940UW pci slot 1, Seagate ST19171W   dos C:
Adaptec 2940UW pci slot 2, Seagate ST19171W   dos D:

The problem is, that the machine sees "C:" as 80h, and when you install 
FreeBSD, it writes the / partition and the other partitions destined for 
SD0 to that wrong drive..DOS drive "D:", or 81h

When you boot, the BIOS attempts to boot from 80h "C:", and of course 
there is no filesystem there, and you get "No Operating System" error.

Why are FreeBSD and the system BIOS mapping different drives to be the 
boot drive?