Description of problem:
I tried to update a test installation of FC2 with FC3 but the install
failed with a complaint about it being unable to mount the /msdos
partition.

My machine has two hard drives (hda and sda) with four partitions on
the first drive and 1 on the second. hda1 is a VFAT partition holding
a copy of Windows. hda2 is Fedora Core 1 root, hda3 is swap, hda4 is a
user partition, sda1 is Fedora Core 2 root.

I told the partitioning step to not format the partitions. I told it
to use sda1 for / and did not tell it to anything with the other
partitions. That is, I did provide mount points for the other
partitions as I would configure them manually after the install.

The install failed with the error indication after telling it to do an
upgrade of the existing FC2 partition (which it had correctly identified).