I had a 750GB NTFS partition, 100GB NTFS partition and 100GB ext4 partition. Recently I formatted my 100GB NTFS partition to ext4 partition with live ubuntu cd. After that, the partitions were changed to 850GB ext4 and 100 GB ext4. All my data of 750GB NTFS is also not showing now. Please help!
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Stop using the computer immediately!
It sounds like you did more than just create an ext4 filesystem on the 100 GB partition. You don't say how you did this, so I can't say what your (presumed) mistake was, but chances are you accidentally operated on the wrong partition or even accidentally did much more extensive partitioning operations.
I can't really be more specific without more specific information, such as a screen shot of GParted or the output of sudo parted -l. (You can do this from a boot of a live USB disk to minimize the risk of doing further damage.)
If I'm right, though, your best hope for full recovery is to restore files from a backup. If you don't have a backup, your best hope for partial recovery is to use a tool like PhotoRec to extract files from the disk onto a separate recovery medium. Some Windows-specific tools are said to do a better job recovering filenames than PhotoRec, but I don't have pointers to specific tools. If I'm right, the odds of your getting your system back to the state it was in before the accident are pretty slim, unless of course you have a recent backup, in which case you can use it.
Rod Smith
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