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Absolute FreeBSD, 2nd Edition by Michael W. Lucas

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The Fast File System

FreeBSD's filesystem, the Fast File System (FFS), is a direct descendant of the filesystem shipped with BSD 4.4. One of the original FFS authors still develops the FreeBSD filesystem and has added many nifty features in recent years. FFS is sometimes called UFS (for Unix File System), and many system utilities still call FFS partitions UFS. FreeBSD is not the only operating system to still use the 4.4 BSD filesystem or a descendant thereof. If a Unix vendor doesn't specifically tout its "improved and advanced" filesystem, it is almost certainly running a derivative of FFS.

FFS is designed to be fast and reliable, and to handle the most common situations as effectively as possible while still supporting unusual situations reliably. ...

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