I installed several OSes in my laptop, that messed my partition table. So I used testdisk to recover it. I worked great and everything was working ok. Then I installed, again, Ubuntu in one of the partitions. I don't know how or why my storage partition, a NTFS partition, was changed to EXT3.

I found a thread about recovering deleted files from a NTFS partition, but I'm unsure about following its suggestions.

I know that none of my files have been deleted, only the file system changed and thats why I can't see them. How can I go back to NTFS so I can recover my files?