I have used the application TestDisk to resurrect a trashed hard disk with good success. It had multiple partitions and they were all gone. Just a scrambled egg kinda mess. It restored all but one of the partitions. I was able to restore that one from a backup. I was impressed.

You can get here:

http://www.cgsecurity.org/wiki/TestDisk_Download

It's available in almost any platform.

It's free too!

Good luck.

sakiZ