For FFS file systems, the largest file system is practically limited by the amount of memory required to
<citerefentry><refentrytitle>fsck
</refentrytitle><manvolnum>8
</manvolnum></citerefentry> the file system.
<citerefentry><refentrytitle>fsck
</refentrytitle><manvolnum>8
</manvolnum></citerefentry> requires one bit per fragment, which with the default fragment size of 4 KB equates to 32 MB of memory per TB of disk. This does mean that on architectures which limit userland processes to 2 GB (e.g.,
<trademark>i386
</trademark>), the maximum
<citerefentry><refentrytitle>fsck
</refentrytitle><manvolnum>8
</manvolnum></citerefentry>'able filesystem is ~60 TB.