I have following situation: by accident I run diskpart clean, then convert to GPT against NTFS MBR disk to which I previously backed up all my data... No other actions were performed with this disk so far. Can you advice me something about chances of successful data restore and best way to restore my data in such situation?
I would give a try to
It can scan your disk, find your filesystems and based on that information rebuild partition table. Use some live cd or just Ubuntu install disk and if you can first backup image of your drive:
or at least beginning of your disk:
P.S. read carefully all warnings from testdisk and think twice before you run
Though I already written this in comments I want to post what worked for me - I used GetDataBack for NTFS and not only was able to restore 99% of my data but also was able to done it quickly. I tried some other utilities back at the time - they tried to scan my drive for a very long time with poor results or no results at all.