A Filesystem is a method of arranging how data is stored on a hard drive. There are many different filesystems on offer, many of the Proprietary (Like NTFS and NSS).

Filesystem List

Filesystems: FAT | FATX | FAT12 | FAT16 | FATX16 | FAT32 | FATX32 | NTFS | JFS | Ext | Ext2 | Ext3 | HPFS | ReiserFS | Reiser4 | HFS+ | FFS | UFS1 | UFS2 | UFSMacOSX | XFS | OFS | BFS | BeFS | OpenBFS | NSS | NWFS | ODS5 | VxFS | ZFS | MFS | IFS | AFS | TVFS | MinixFS | SkyFS | AtheOSFS | ArlaFS | CDFS | UDF | CFS | DFS | OpenAFS | GFS | DTFS | CODA | UMSDOS | OldBeFS | RFS | EFS