The NTFS file system provides better performance and security for data on hard disks and partitions or volumes than the FAT file system used in some earlier version of Windows. If you have a partition that uses the earlier FAT16 or FAT32 file system, you can convert it to NTFS by using the convert command. Converting to NTFS does not affect the data on the partition.
After you convert a partition to NTFS, you cannot convert it back. If you want to use the FAT file system on the partition again, you'll need to reformat the partition, and this will erase all data on it.
Some earlier versions of Windows cannot read data on local NTFS partitions. If you need to use an earlier version of Windows to access a partition on the computer, do not convert it.
Although the chance of corruption or data loss during a conversion is minimal, you should back up all data on the partition before you begin.
Close any open programs running on the partition or logical drive to be converted.
In the Command Prompt window, type convert drive_letter: /fs:ntfs, where drive_letter is the letter of the drive you want to convert, and then press ENTER. For example, convert E: /fs:ntfs would convert drive E to the NTFS format.
If the partition you are converting contains system files—which would be the case if you are converting your entire hard disk—you will need to restart your computer for the conversion to take place. If your disk is almost full, the conversion process might not succeed. If you receive an error, try deleting unnecessary files, or back up files to another location, to free up disk space.