Both offers covered cassette and floppy disk versions. Slackware S/390 installs from a DOS Partition or from floppy disk. At first, access was through proprietary software distributed on a 5.25-inch floppy disk. A similar format that supported compression of floppy disk images is called DART. It is not rewritable and lacks most elements of the IBM floppy disk patent. An Easter egg is present on the Apple II floppy disk release. This is a list of different floppy disk formats. However, cartridges were expensive to manufacture compared to making a floppy disk or CD-ROM. A command for comparing the complete contents of a floppy disk to another one. An alternative to cassette tape and floppy disk storage was provided by Exatron. It used the entire space of a 1.2 MB floppy disk. It was made available as a floppy disk accompanying the printed journal. Files of this kind are often used for CD ISO images and floppy disk images. However, it was never popular enough to replace the -inch floppy disk. It is read and written using a floppy disk drive (FDD).