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I installed Ubuntu 12.04 on my laptop and chose the option "Erase disk and install Ubuntu" from liveUSB without any backup. When I realized that this would format my whole HDD, I immediately unplugged the usb and turn off my laptop. However, it seems that my whole HDD had been formatted: I have 4 partitions before but there's only 1 partition formatted in ext4 now with the size equal the HDD's size.

Is there anyway I can get my data back? I believe that my data is still there on the disk. I've searched for a while and tried using Testdisk and parted but no luck: Testdisk cannot find any partition even after trying "Deeper Search"

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In theory, they should still be there. Try this: disk-utilities.com/data-recovery/format-recovery.html. And by data you mean important files other than the previous OS files, right? – WikiWitz Dec 29 '12 at 10:03
    
@WikiWitz: Yes, I mean my document and media files, not the OS files – minhduc Dec 29 '12 at 11:06

You can use PhotoRec in sysresccd Live Distro.

Read PhotoRec's manual fisrt. It's here.

Download sysresccd here.

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