GEOM label tasting of windows disk hangs on 8.1

[Bengt Ahlgren]

Hi!

When I was trying to install 8.1-REL from the dvd install media on a
ThinkPad X40 that has the original Windows XP partitions on its disk,
the geom label tasting seems to hang with the disk activity light on.
I just submitted this PR:

http://www.freebsd.org/cgi/query-pr.cgi?pr=149523

7.3-REL works just fine.

Is this a known issue?

I assume that wiping the mbr will fix it, but I will defer that if
additional debugging is needed.

Bengt