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I was having ubuntu 10.04 on my system, and 2 partitions one with 80 GB and the Other with 70 Gb. I took a backup from 80 GB partition and saved it in 70 GB, I installed Ubuntu 11.04 on my system, when i loged in I found there is only one partition of 160GB size, I guess I have formated both the partitions and they are merged now, tried to look the size and found only 18 MBs Of Data. I was having very important data in it, Please help me out how can i recover it. Is there any way i can do that?

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You have provided an NTFS/FAT link and thats Windows file system I am asking about Linux System. – ScoRpion Dec 22 '11 at 11:07
My bad, you're right. Kept the wrong link. Generally though, there's not much you can do. See here, and have a look for ext filesystem recovery tools. – slhck Dec 22 '11 at 11:11
Backups, Backups, Backups, Backups, Backups, Backups – RedGrittyBrick Dec 22 '11 at 11:15

Your data is most likely not recoverable. You could try to boot from another drive and try to use a utility like TestDisk on it but it is far more likely that you won't be able to get anything back without Backups

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