While I was trying to install ubuntu 20 in place of ubuntu 18, I accidently erased the disk and installed ubuntu 20.04.
I didin't had any important data in ubuntu 18, but in windows partition I had three drives, C, D and E.
By usnig testdisk I was able to find drives D and E in a deeper search and I succesfully copied the content into an external hard drive.
But I was not able to list or find the content of the C drive and I don't remember the exact partition size. I checked the whole list of deeper search but I was not able to list the content of my C drive in any partition.
But what I found was a partition of blocksize=4096, 430 GB / 401 GiB which says NTFS found using backup sector. I am assuming by all the posts that I read and the official documents of testdisk that this partition is the backup of my windows partition. But when I try to list the files of this partition it says Can't open filesystem. Filesystem seems damaged.
Now I see the options I have are
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Use Left/Right Arrow keys to CHANGE partition characteristics: P=Primary D=Deleted
Any help is appreciated. Thanks in advance!