The bios disk geometry bug has been an 5.2 release show stopper bug
for a lone time. Looks like they still have not corrected it. You
should submit an problem report containing much of the data you have
in this post. The more people who report this bug the higher up in
the severity list it moves
Yes, I too have encountered the geometry bug a number of times on
different machines, and for awhile it put me off to using FreeBSD. Then
I discovered that if you just hit g during the partitioning process,
it finds the correct geometry and you can continue with the
installation. At least, this