...
When I did an install of Mandrake on /hdb and used the
partition tool that was part of the install, I noticed
that some space was available on /hda, strangely in
the middle of my four Windows partitions. I decided
that since it was a sizable chunk (about 1GB), I'd
turn it into /swap. When I booted into WinXP Pro
after I installed Mandrake, it seems Windows
recognized two of my three secondary NTFS partitions
on /hda as Hidden NTFS partitions. Since they are
"Hidden", Windows will not let me designate drive
letters to them. Oops. This is the first time I have
had this problem, and if I wipe those two partitions
out, no real loss.
...
If it really is just a hidden partition type in the partition table, you can
always just run fdisk *under linux* and change the partition type (this is
non-destructive, but always back up first) to whatever windows expects.
--MonMotha