NTFS stands for New Technology File System. NTFS was introduced with Windows NT in 1993. NTFS has several features above those offered in the FAT file systems. Two main features are access control and file system journaling. Access control is handled in NTFS through access control lists. A user or group can be granted Read, Write, Read & Execute, Modify or Full Control permissions to any file or folder. File system Journaling is a method of reducing any file system errors. NTFS's journaling ensures that the integrity of the file system remains in tact. It can not however guarantee that the actual data on disk is not damaged. For example, if a crash occurs while data is being written to the disk, the file system can recover without errors but the data which was being written may not be recoverable. NTFS keeps information about all files and folders on the system in the Master File Table (MFT).
NTFS is an extremely scaleable file system. The maximum file and partition size are virtually unlimited. The actual maximum NTFS partition size is 18,446,744,073,709,551,616 bytes. This is 18 billion gigabytes.
Alternative Data Stream
Files in NTFS can have more then one stream. Alternative streams usually contain file related metadata. For example, MP3 music file may contain unnamed stream, where data are stored, and one or several additional streams where composition genre, album name and author name are stored.