X-Nico

2 unusual facts about Unix File System


FFS2

FFS2, Unix File System, Berkeley Fast File System, the BSD Fast File System or FFS

Unix File System

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.


Marshall Kirk McKusick

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".

USB mass storage device class

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).


see also