FFS2, Unix File System, Berkeley Fast File System, the BSD Fast File System or FFS
Marshall Kirk McKusick, then a Berkeley graduate student, optimized the BSD 4.2's FFS (Fast File System) by inventing cylinder groups, which break the disk up into smaller chunks, with each group having its own inodes and data blocks.
operating system | Super Nintendo Entertainment System | Nintendo Entertainment System | Unix | Android (operating system) | Unix-like | Global Positioning System | Solar System | X Window System | UNIX | File Transfer Protocol | Korean Broadcasting System | System of a Down | Domain Name System | Seoul Broadcasting System | North Carolina Community College System | Mutual Broadcasting System | Bulletin board system | system | Turner Broadcasting System | Program and System Information Protocol | Geographic information system | Ubuntu (operating system) | Tokyo Broadcasting System | Federal Reserve System | Youth system | Tagged Image File Format | Embedded system | solar system | Seigneurial system of New France |
More recently, he implemented soft updates, an alternative approach to maintaining disk integrity after a crash or power outage, in FFS, and a revised version of UFS known as "UFS2".
However, a keydrive or any other device may be formatted using another filesystem (for example HFS Plus on an Apple Macintosh, or Ext2 under Linux, or Unix File System under Solaris or BSD).