As they are plain disk images, they can be handled by the Unix tool dd. The WinUAE Amiga emulator supports all three disk formats, but 3.5-inch double-density is the most common.ĪDF files can be downloaded and copied to Amiga disks with the EasyADF application and various applications freely available on the Internet. The Amiga also had 5.25-inch double-density disks. There are also 3.5-inch high-density floppy disks, which hold up to 1.76 MB of data, but these are uncommon. Most Amiga programs were distributed on double-density floppy disks. The size of an ADF will vary depending on how many tracks have been imaged, but in practice it is unusual to find ADF files that are not 901,120 bytes in size (80 cylinders × 2 heads × 11 sectors × 512 bytes/sector).
Most ADF files are plain images of the Amiga-formatted tracks held on cylinder 0 to 79 of a standard 3.5-inch (89 mm) double-density floppy disk, also called an 880 KiB disk in Amiga terms.
This file would, typically, be formatted, like the disk, in Amiga Old File System (OFS). ADF is a track-by-track dump of the disk data as read by the Amiga operating system, and so the "format" is really fixed-width AmigaDOS data tracks appended one after another and held in a file. Before it was known as ADF, it was used in commercial game production, backup and disk virtualization. It has been around almost as long as the Amiga itself, although it was not initially called by any particular name.
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