Open the Terminal Window and type :
$ sudo fdisk - l
This will show your harddisk partition information.
Mount the partitons you need in the '/mnt' folder and access all the partitions.
For eg., open the Terminal Window & type:
$ cd /mnt
$ sudo mkdir lin_part
(This will create a folder called 'lin_part' in the '/mnt' folder.
Now whichever partition you want to mount ( based on the readings of 'fdisk- l')
$ mount /dev/hda2 /mnt/lin_part
(this will mount the partition in '/dev/hda2' in '/mnt/lin_part' )
do the same for other partitions you want to mount. Note they must be mounted
under a different folder. So create another folder under the '/mnt' folder.
To unmount the partition type:
$ umount /dev/hda2