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Amiga Fast File SystemThe Amiga Fast File System (FFS) is an interesting filesystem used on the Amiga microcomputer. It was originally designed for use on floppy disks, so it had the root block right in the middle of the disk (to minimise access time to other parts of the disk). Metadata tended to collect in the middle of the disk too, which improved some performance characteristics. It was block-based, with a default block size of 512 bytes. Listing directories tended to involve lots of seeks around the disk, so were quite slow. It was not really appropriate for hard drives, but used for them nonetheless. As with many Amiga filesystems, it did not need to be specifically unmounted in order to mount cleanly afterwards. However, this was a bit of a con, because when a write occurred the system would mark the disk as "unclean", alter it, then mark it "clean" again. If you switched the system off half-way through this, you would have to run the "disk-doctor" over the disk, which would perform an integrity check, then sometimes rename the disk "Lazarus". See also
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