I have a GPT disk that had a single NTFS partition on it (other than the MSR partition, that is). A rogue boot manager overwrite the GPT header and partition tables. Fortunately, GPT and NTFS both keep backup copies of themselves elsewhere on the disk, and I was able to find and restore these with testdisk. However, the partition now shows up as "MS Data" type. When I use testdisk to try to change the type, this is what happens:
1. Highlight the partition in question.
2. Press "T" to change type
3. A screen comes up with many different partition types, MS Data is pre-selected.
4. Press enter to proceed.
5. A second screen with more partition types comes up. Select NTFS. Press Enter.
6. Partition still shows up as MS Data, not NTFS.
There does not seem to be any way to advance from the first partition type selection screen to the second, except by highlighting a choice and pressing Enter. Whatever is then selected on the second page (e.g., NTFS) is subsequently ignored when Enter is pressed again.
Don't understand what I am doing wrong.