Windows OS supports the conversion of a FAT volume to a NTFS volume without deleting the files on the drive. We can do this using the command convert. You can find syntax below.
convert drivename /FS:NTFS
Example: To convert E: drive from FAT to NTFS, we can run the below command.
convert E: /FS:NTFS
Adding /X switch forces the command to unmount the volume if required.