Recovering lost partitions

[Odaisé Gaelach]

It's got an Undelete feature, but that only recognises partition no. 6, which is 30GB big. No. 5 is still missing, and that's the 110GB partition.

EDIT: Huh, according to the help file:

You cannot undelete a partition that has been completely or partially overwritten by another partition or file system.

The fourth partition grew by 10GB when I restarted, so it might have overwritten part of the fifth partition. Still, most of the data should be there if I look for it.

I used Partition Magic to check the fourth partition for errors, but nothing came back. I didn't run Chkdsk because I'm wary of mounting the partition, in case it destroys data from No. 5.

EDIT 2: Ah, it's okay now. A friend's offered to scan the drive for me and see if he can recover anything. Thanks for your help anyway.