If you chose FAT or FAT32 for your file management system when you installed Windows 2000 but still want to take advantage of Windows' better, higher-security file management based on Windows NT File System, there is a solution.
You can convert the disk or partition - but it's time-consuming. First, you must boot from a different disk or partition, which is easiest to do using a system boot disk. (See "Create a boot disk" in "System maintenance".)Start the system in command line mode - it's an option that shows up during Windows 2000's boot-up. Its syntax is: convert [drive:] /fs:ntfs [/v].
To convert your C: drive to NTFS you would enter convert c: /fs:ntfs with an optional /v at the end to specify verbose mode, that is, to display all messages as the drive is being converted.
Be aware that once NTFS is set up, the system will no longer be able to boot MS-DOS or Windows 9x.