I do not have your gui, but the command line interface should be similar.
Get to the commandline by activating a "terminal" (looks like a little black monitor icon)
At the $ prompt, type
$cat /proc/partitions
This will show what was found during booting up. I expect you will see something like
major minor #blocks name
3 0 195360984 hda
3 1 96358 hda1
3 2 1951897 hda2
3 3 19535040 hda3
Then look at /dev/hda1, for example:
$ ls -l /dev/hda1
brw-rw---- 1 root disk 3, 1 2003-11-06 19:13 /dev/hda1
This shows a partition that ordinary users may not access, only root, or members of the disk group.
For your purposes, you may want to make the partition readable by an ordinary guy, so
sudo mkdir /mnt/part
sudo mount /dev/hda1 /mnt/part -o ro
sudo ls -l /mnt/part
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