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{{Filesystems}}
There are several filesystems existing that are abbreviated '''SFS''', but the one discussed here is
SFS is designed to be used as a simple filesystem for use on floppy disks and other removable media to transfer data between computers.
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There are five key areas in a SimpleFS partition: The Super-block, Reserved Area, Data Area, Free Area and Index Area.
=== Super-block ===
The Super-block is located in the first sector of a disk or partition. For floppy disks that means it is contained in the boot sector. The superblock contains structural information about the partition. The SFS data of the super-block is located at offset
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! Offset
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| Last alteration time of super-block values (Data size or Index Size)
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The "first" (at the end of the disk) entry must be a Volume Identifier entry, this is used to detect if a disk has been swapped when auto-detection is unavailable. The "last" (closest to the start of the disk) must be a Starting Marker entry, this is used for file-system recovery if the super-block is damaged.
Continuation entries are used to allow longer file names than can be placed in a single directory or file entry and immediately precede their respective file/directory entry.
=== Embedding ===
The GUID currently in use for GPT partitions is 4ebf0e06-11bf-450c-1a06-534653534653
== Information Formatting ==
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Name Strings in SFS are in UTF-8 and must be null terminated. Characters can include any character in the ranges 0x20-0x7E and 0xA1-0xFF excluding a double quote ("), asterisk (*), colon (:), less than or greater then sign (< or >), question mark (?) or backward slash (\). The forwards slash (/) is admissible only as a path separator.
Note that UTF-8 means that the characters above 0x80 take up multiple bytes rather than one, which could confuse ASCII based systems.
== External Links ==▼
==
=== Threads ===
* [[Topic:11833|SFS Review thread]]
▲=== External Links ===
* [https://www.d-rift.nl/combuster/vdisk/sfs.html Official Specification] ([https://web.archive.org/web/20090923015653/http://dimensionalrift.homelinux.net/combuster/vdisk/sfs.html web.archive.org])
* [https://www.d-rift.nl/combuster/vdisk/ A windows utility for SFS images] ([https://web.archive.org/web/20111111113756/http://dimensionalrift.homelinux.net/combuster/vdisk/ web.archive.org])
* [https://www.fysnet.net/blog/files/sfs.pdf Ben Lunt's specification] (updated 13 Jan 2022) (not 100% compatible with the original, has more features) (version 1.10)
[[Category:Filesystems]]
[[de:SFS]]
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