In the NTFS file system, several file types exist.
Small files are contained entirely within a single record in the Master File Table (MFT).
Large files are stored elsewhere on the disk, but the index information pertaining to the file, including the locations of the various fragments of the file, is contained within a single record in the MFT.
Huge files are similar to Large files, but they have enough additional file record information (such as additional file security information, or a large number of file fragment locations) to require two or more file records within the MFT.