Rollback NTFS-part. drive letter change

Unther win NT4 I created a second partition on my winchester drive, formatted it as an NTFS partition and assigned the free letter G: since E and F: where used for removable disks. I did moved some files on it, to see if it worked. After having freed the drive letter D: that was used for a non-used disk, I change the drive letter from G: to F: for that new partition. Supprise, supprise, now
it is unknown for the OS, it doesn’t recognise it anymore as an NTFS-partition. Neither changing the drive letter is producing a result. Can I get it back as a usable NTFS-partition and recover the data on it?
Pieter Sermeus