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UserDoc:AmigaOS File Systems

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AmigaOS File System Table
FastFileSystem
(FFS)
FastFileSystem 2
(FFS2)
SmartFileSystem
(SFS)
SmartFileSystem 2
(SFS2)
JXFS NGFS
Bootable? Yes Yes Yes Yes No Yes, on AmigaOne X-1000 and later machines using amigaboot
DosType DOS\03 0x444f5303 DOS\07 0x444f5307 SFS\00 0x53465300 SFS\02 0x53465302 JXF\04 0x4A584604 NGF\00 0x4E474600
Max. Filename Length 30 characters 107 characters 107 characters 107 characters 107 characters 255 characters (fewer if the filename is UTF-8 encoded)
Max. Partition Size 2 TB to 128 TB 2 TB to 128 TB 128 GB 1 TB 256 TB 100 EiB
Max. File Size 4 GB - 2 Bytes 4 GB - 2 Bytes 4 GB - 2 Bytes 1 TB 256 TB 2^64 - 1 Bytes
Supported Block Size 512 to 32768 512 to 32768 use 512 use 512 512 256 to 65536 (auto selected)
Comments Legacy file system, not recommended for AmigaOS 4.x due to lack of long filename support. Can be used for bootloader partition in AmigaOS 4.x only setup. Current file system, bootable, can be used with AmigaOS 4.x, recovery tools available, not as fast as SFS, requires validation if disk error. Current file system, bootable, can be used with AmigaOS 4.x, some recovery tools available. Fast, does not require validation if disk error. Current file system, bootable, can be used with AmigaOS 4.x. Fast, does not require validation if disk error. No recovery tools. Fastest but not backwards compatible with some 68K legacy software. No recovery tools. Discontinued starting with 4.1 Final Edition. Vector-port-based file system, full DOS compatibility. Journalling, full check/repair facility provided.
  • SFS\00 and SFS\02 support other block sizes but only 512 bytes should be used since it is slower with larger blocks. JXFS only supports 512 block size.
  • Recovery tools are located in Media Toolbox in the SYS:System drawer. Always have a backup!