Lost partition

Hi,
I wanted to dual boot ubuntu, so started partitioning my HD.
I gave the new one 40gb, and started the process.
During the process the system froze, and a message to reboot showed up, and since I couldn't do anything else, followed the instructions.
Now I am lucky to still have my OSX partition working fine, however I lost 40gb, I assume because the process got interrupted. The 40gb are just gone, can't see it in Disk Utility.
Is there an easy way of getting this back?
At this time I'm thinking of doing:
1. Take a backup of entire system with time machine (to an external drive)
2. erase the OSX partition and format - how can I do this? will the Snow Leopard install disc allow me to do this?
3. reinstall OSX
4. restore from time machine backup
Would this give me back my missing 40gb, and restore my system EXACTLY as it was?
Would appreciate some advice.
Thanks in advance
A

Hi sg1969;
My plan is as follows;
1, Create a clone with either CCC or SuperDuper
2, Boot from clone
3, Use Disk Utility to reformat internal disk
4, Clone back from external disk to internal disk
5, Reboot from internal disk
Allan

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