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Absolute FreeBSD, 2nd Edition by Michael W. Lucas

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Other FreeBSD Filesystems

In addition to FFS and non-FreeBSD filesystems, FreeBSD supports several special-purpose filesystems. Some of these are interesting but not generally useful, such as mount_umapfs(8), while others are very useful or even required in certain circumstances. We'll talk about memory filesystems, a popular optimization for certain environments; building filesystems on files; as well as the procfs and fdescfs filesystems occasionally required by software packages.

Memory Filesystems

In addition to using disks for partitions, FreeBSD lets you create partitions from files, from pure RAM, and from a combination of the two. One of the most popular uses of this is for memory filesystems, or memory disks. Reading and writing files to ...

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