malaire,

sudo mdir /hda1 goes fine
sudo mount /dev/hda1 /hda1 - outputs mount: /dev/hda1 already mounted or /hda1 busy

Also, mount | grep hda outputs nothing.

cat /proc/partitions outputs:

major minor #blocks name

3 0 20044080 hda
3 1 19189611 hda1
3 2 1 hda2
3 5 851413 hda5
240 0 1991680 cloop0
254 0 20044048 dm-0
254 1 19189611 dm-1
254 2 851413 dm-2