To convert a FAT partition to NTFS, perform the following steps.
1) Open ‘Command Prompt’.
2) At the command prompt, type the following-
CONVERT [driveletter]: /FS:NTFS.
‘Convert.exe’ will attempt to convert the partition to NTFS.
NOTE :- Although the chance of corruption or data loss during the conversion from FAT to NTFS is minimal, it is best to perform a full backup of the data on the drive that it is to be converted prior to executing the convert command.