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.