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===OS/2=== [[OS/2]] 1.2 introduced the [[High Performance File System]] (HPFS). HPFS supports mixed case file names in different [[code page]]s, long file names (255 characters), more efficient use of disk space, an architecture that keeps related items close to each other on the disk volume, less fragmentation of data, [[Extent (file systems)|extent-based]] space allocation, a [[B+ tree]] structure for directories, and the root directory located at the midpoint of the disk, for faster average access. A [[JFS (file system)|journaled filesystem]] (JFS) was shipped in 1999.
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