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and scanning it this could take a long time and made it very slow to access the disk until it was finished especially on slower media as hard drives got larger and contained more files the validation process could take many hours in addition files and directories could feasibly be lost often without the user being notified or even aware during the process if their data hashes were corrupted in some cases the validator could fail and leave the disk in a non validated state requiring the user to use a third party disk tool like disksalv to make the volume writable again or simply save the files by copying them to a fresh partition a very slow process ffs was also originally limited to 32 bit addressing and therefore about 4 gb drives or at least the first 4 gb on a larger drive attempting to use ffs partitions beyond this limit caused serious data corruption all through the drive ffs belatedly got some third party 64 bit patches and then official but non commodore updates to allow it to circumvent these limitations the latter were supplied with amigaos 3 5 and 3 9 from haage partner the former often were supplied with third party disk controllers such as those from phase5 where the ability to use large capacity disks was a selling point the two systems were not mutually compatible in terms of support tools although commodore itself only shipped with an application called diskdoctor and later removed it from amigaos disks ffs had a small selection of third party tools most notably disksalv to maintain the file system and repair and validate it undelete files or reverse quick formats filesystem initializations an ofs or ffs volume had to be locked to defragment or convert to different ffs modes to prevent corruption and this made it inaccessible to everything but the tool defragmenting it most of these tools were not updated when ffs became capable of 64 bit addressing and could only operate on partitions smaller than 4 gb they could not read partitions bigger than 4 gb and would generally corrupt partitions beyond the 4 gb boundary when hard drives in use by amiga users were reaching 4 gb in size this became a problem for all of these reasons ffs was often replaced by users in the mid 1990s with more up to date alternatives such as smart file system sfs and professional file system pfs which did not have these limitations and were considered safer faster and more efficient sfs in particular continued to be developed and is now when as close to a generic amigaos filesystem as ffs history edit ffs was introduced with version 1 3 of amigaos 1 in 1988 2 and replaced both the kickstart rom or kickstart floppy for a1000s and workbench floppy with updated software it carried the version number of v34 like the rest of the amigaos 1 3 components kickstart 1 3 provided autobooting support so that the machine could now be booted from hard disk or reset proof ram disk rad whereas earlier kickstart releases could only be booted from floppy disk workbench 1 3 provided the ffs filesystem device driver on disk which could be copied into the rigid disk block rdb on hard disks compliant block devices would then load and install the filesystem driver before filesystems were mounted and thus make it possible to use loadable filesystems on hard disks kickstart 1 2 could boot workbench 1 3 from floppy and vice versa but it needed both kickstart and workbench 1 3 to autoboot ffs formatted hard disks ffs support was merged into the rom based filesystem from kickstart 2 0 onwards and so it was no longer necessary to install ffs in the rdb the ability to load filesystems from the rdb still remained available in case one wished to fix rom bugs get new ffs features or use a third party filesystem floppies are unpartitioned devices without a rdb and also do not use the autobooting mechanism so were only bootable if the disk s dostype was one the rom based filesystem understood as a result ffs formatted floppies were not bootable until the release of kickstart 2 0 and mounting them under workbench 1 3 involved some ugly unsupported hacks similarly directory cache variants were not bootable or supported until kickstart 3 0 the various ffs flavours did not have any compatibility problems with amiga software even ones that were considered system unfriendly software would either use the system calls and thus work with any filesystem or be trackloaders and not use a filesystem at all ffs operated in several modes defined by dostypes amigaos filesystems are identified by a four letter descriptor which is specified either in the rdb or a mountlist or dosdriver alternatively as was the case in trackdisk like devices like floppy disks the disk itself could be formatted in any dostype specified ffs dostypes were as follows 3 dos 0 the original amiga filesystem ofs this was left in for compatibility purposes and the majority floppy disks shipped by software companies or as magazine coverdisks used this dostype so that they would boot on pre 2 x machines like the amiga 500 it also meant that users with existing ofs formatted drives could read them once they had installed ffs to the rdb dos 1 the new filesystem ffs the first disk based releases of ffs did not have any additional modes amigaos 2 04 made ffs now v37 part of the kickstart rom and introduced new modes for handling international characters in filenames 4 and for an on disk directory cache each new mode was available with both ofs and ffs dostypes this odd system was for parity ofs modes apart from dos 0 were almost never used but were available nonetheless although ofs they were still not compatible with amiga systems without ffs the four new dostypes introduced with v37 of ffs dos 2 international ofs intl mode allows ofs to handle filenames with international characters i e those not found in english latin character set such as ä and ê dos 3 international mode for ffs ffs intl this was the most commonly used ffs mode all higher dostypes have international mode always enabled dos 4 directory cache ofs dc mode enabled to primitive cache by creating dedicated directory lists instead of having to pick up the linked directory file entries that lie scattered over the disk a certain small amount of disk space to store the directory data is allocated 5 the dircache option improved directory reading speed drastically but creating deleting and renaming files became slower it did not increase the speed of reading individual files it became a popular choice on amiga hard drives but according to olaf barthel author of ffs2 the use of dircache modes was probably better for floppy disks than it was for hard drives where it would cause an overall degradation in performance compared to lack of dircache citation needed despite this it was rarely used on floppies particularly because of the cache eating precious space and because of the limited space preventing a large number of files to cache in the first place the dircache mode lacks a garbage collection mechanism which means that partly filled cache blocks are never consolidated and will keep taking up space 6 dos 5 directory caching with ffs ffs dc both dircache modes were not backwards compatible with earlier versions of ffs version 40 1 was the last version of ffs released by commodore and came with amigaos 3 1 both on the os disks and in the rom after this several unofficial patches appeared which allowed its use on drives after the first 2 gb of a hard disk using a 64 bit addressing system called trackdisk64 or td64 although the 2 gb limit on file size and the 127 gb limit on partition sizes remained as it was a limitation of amigaos dos library and all then current amiga software and carried the version number of v44 the version of ffs that came with amigaos 3 5 and 3 9 was v45 and differed in that it used a different 64 bit addressing system new style device or nsd more recently from 2003 morphos and amigaos 4 have introduced support for a slightly updated ffs2 by olaf barthel ffs v46 v50 respectively this is compatible with the older ffs it is powerpc native and introduced two more dostypes which are not capable of being read by the older ffs dos 6 long filename ofs lnfs this allowed files to have a longer filename up to 107 characters than the usual amiga limit which was 31 characters 6 dos 7 long filenames for ffs ffs lnfs there were no directory caching modes available for lnfs dostypes and international mode was always enabled despite the ability to use the long filenames by this time ffs compared very poorly to other available filesystems on the platforms it was available for apart from these extra dostypes there are little or no functional difference between ffs and ffs2 although some older non specified bugs may have been dealt with and should still not be used except for legacy purposes disk validation is still necessary in ffs2 and may still result in data loss just as it was on ffs despite early beliefs to the contrary in september 2018 hyperion entertainment released amiga os 3 1 4 from the amiga os 3 1 source it included an updated fastfilesystem v46 in the kickstart rom the v46 ffs natively supported the apis for td_64 nsd and or the classic 32 bit td_ storage calls this lets the amiga os v3 x use and boot from large media 4gb natively and support 2gb partition sizes in july 2019 an additional file based update to ffs was contained in the 3 1 4 1 update 7 in may 2021 an updated amiga os 3 2 was released 8 and provided a matching rom based v47 ffs update which gained a few minor features and fixes other implementations edit there were few other implementations which are able to read ffs filesystems which would normally require an amiga emulator and a copy of the operating system roms to be read most notably support for affs amiga fast file system can be compiled into linux kernels and offers full read write and format support on ffs and ofs partitions of all dostypes except dos 6 and dos 7 which are probably incredibly rare on the amiga the freeware application xfs 9 could among many filesystems read and write to devices formatted in ofs or ffs and was probably the sole amiga filesystem apart from ffs ffs2 itself to do so it did not support dos 6 or dos 7 which it predates or formatting of devices see also edit amiga portal list of file systems ofs professional file system smart file system references edit wb_13chg txt retrieved nov 12 2012 1 3 release confirmed on september 16 1988 by carolyn scheppner of cats in amiga dev in bix copy of bix announcement from usenet amigaos user manual 3 1 all amiga file systems can handle international characters but prior to the international versions they treated upper and lower cased letters as completely distinct characters amiga history guide www amigahistory co uk retrieved may 1 2017 a b dcfs and lnfs low level data structures amigaos documentation wiki wiki amigaos net retrieved 2017 05 07 update to amigaos 3 1 4 released news http de4 aminet net disk misc xfs readme bare url external links edit the adflib page and precisely adf file specs the adf specs in lha format from aminet v t e amigaos amiga technologies amigabasic amigados amigaguide arexx blitter object camd exec warpos guru meditation hunk installer intuition kickstart ram disk workbench xad amiga guis ambient mui opus magellan reaction scalos workbench zune file systems crossdos ofs ffs pfs sfs udf fat ntfs os versions amigaos version history amigaos 4 software packs amiga forever amikit other software aminet amiga reflections demos games hollywood adf iff lha whdload winuae yam amizilla influenced aros atheos beos dragonfly bsd morphos syllable category v t e morphos hardware a1200 a3000 a3000t a3000ux a4000 a4000t efika pegasos mac mini emac power mac g4 powerbook g4 ibook g4 power mac g5 components ahi ambient amigados camd cybergraphx mui powerup ram disk turboprint warpos more file systems fat ofs ffs ext2 hfs ntfs pfs sfs software blender cubic ide hollywood netsurf origyn web browser yam more games aquaria the battle for wesnoth knights and merchants openttd robin hood quake iii stratagus more v t e file systems comparison of file systems distributed unix filesystem disk and non rotating adfs advfs amiga ffs amiga ofs apfs athfs bcachefs bfs be file system boot file system byte file system z vm btrfs cvfs cxfs dfs efs encrypting file system extent file system episode ext ext2 ext3 ext3cow ext4 ufs ufs2 fat exfat files 11 fossil gpfs hammer hammer2 hfs classic mac os hfs mvs hfs hpfs htfs jfs lfs mfs macintosh file system tivo media file system minix netware file system next3 nilfs nilfs2 nss ntfs onefs openzfs pfs qfs qnx4fs refs reiserfs reiser4 reliance reliance nitro rfs sfs shared file system vm smart file system snfs soup apple tux3 ubifs ufs soft updates wapbl vxfs wafl xiafs xfs xsan zfs z os zfs sun optical disc hsf iso 9660 iso 13490 udf flash memory and ssd apfs fat exfat tfat erofs f2fs jfs nvfs host side wear leveling chfs jffs jffs2 logfs nilfs nilfs2 yaffs ubifs distributed parallel beegfs cxfs gfs2 google file system ocfs2 orangefs pvfs qfs xsan more nas 9p afs openafs afp coda dfs google file system gpfs lustre ncp nfs pohmelfs hadoop smb cifs sshfs more specialized aufs axfs boot file system cdfs compact disc file system cramfs davfs2 erofs ftpfs fuse lnfs ltfs nova mvfs squashfs umsdos overlayfs unionfs pseudo configfs devfs debugfs kernfs procfs specfs sysfs tmpfs winfs encrypted ecryptfs encfs efs rubberhose sshfs zfs types clustered global grid self certifying flash journaling log structured object record oriented semantic steganographic synthetic versioning features case preservation copy on write data deduplication data scrubbing execute in place extent file attribute extended file attributes file change log fork links hard symbolic access control access control list filesystem level encryption permissions modes sticky bit interfaces file manager file system api installable file system virtual file system lists cryptographic default log structured layouts master boot record guid partition table apple partition map retrieved from https en wikipedia org w index php title amiga_fast_file_system oldid 1108484500 categories disk file systems amiga amigaos morphos file systems supported by the linux kernel hidden categories all articles with bare urls for citations articles with bare urls for citations from september 2022 articles with short description short description matches wikidata articles that may contain original research from may 2017 all articles that may contain original research all articles with vague or ambiguous time vague or ambiguous time from may 2017 all articles with unsourced statements articles with unsourced statements from may 2017 navigation menu personal tools not logged in talk contributions create account log in namespaces article talk english views read edit view history more search navigation main page contents current events random article about wikipedia 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