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Looks like Sun’s CEO, Jonathan Schwartz, has spilled the beans on Leopard’s file system. According to this article at ComputerWorld, Apple will be using Sun’s open-source ZFS (Zettabyte File System) file system. If true, replacing the current HFS+ file system with ZFS could produce marked performance increases. The 128-bit file storage system features “pooled storage,” meaning users simply plug in additional drives to create more storage without worrying about volumes and partitions.