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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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Partition Filesystems

The words filesystem and partition are often used interchangeably. They are closely related, but two different things. A filesystem is a method of allocating and tracking files that are on a partition. You can back up and restore a filesystem, but if a partition is damaged, you’re in much worse trouble.

OpenBSD uses the standard Fast File System (FFS) by default. FFS has been around for decades, and is both well debugged and well understood. Unfortunately, with its default settings, it can handle partitions only up to slightly less than 1TB in size. Modern disks make partitions of that size common.

If a partition is 1TB or more in size, the installer automagically formats it with FFS version 2 (FFS2). In Chapter 8, we’ll ...

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