Determines if the filesystems supports multiple data streams. NTFS refers to these as alternate data streams, HPFS as extended attributes and HFS calls them forks. Per-volume compression Does the filesystem support real-time transparent compression and decompression of an entire volume. Per-volume encryption Does the filesystem support real-time transparent encryption and decryption of an entire volume. Per-file compression Does the filesystem support real-time transparent compression and decompression of individual files. Per-file encryption Does the filesystem support real-time transparent encryption and decryption of individual files. Access control lists Does the filesystem support multi-user access control lists (ACLs). Computer file systems