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The '''Smart File System''' ('''SFS''') is a journalling filesystem used on [[Amiga]] computers. It is designed for performance, [[scalability]] and integrity. It uses block sizes ranging from 512 (2<sup>9</sup>) to 32768 (2<sup>15</sup>) [[byte]]s with a maximum partition size of 1 TB (1024 GB) or more depending on the block size.
Good performance of the filesystem is realized by grouping multiple directory entries into a single block and by grouping meta data blocks together into clusters. A bitmap is used to keep track of free space, and file data is kept track of using extents arranged into a [[B-tree|B+ tree]] structure.
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