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: 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, 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),