Slackware S/390 installs from a DOS Partition or from floppy disk. Images were stored on video floppy disks. However, Zip disk housings are much thicker than those of floppy disks. It enables higher than normal capacity formatting of floppy disks. Both offers covered cassette and floppy disk versions. Early PCs had to be booted from floppy disks. An alternative to cassette tape and floppy disk storage was provided by Exatron. It is not rewritable and lacks most elements of the IBM floppy disk patent. A similar format that supported compression of floppy disk images is called DART. In the early days of home computing, floppy and hard disk drives were very expensive. It used the entire space of a 1.2 MB floppy disk. However, cartridges were expensive to manufacture compared to making a floppy disk or CD-ROM. This is a list of different floppy disk formats. A command for comparing the complete contents of a floppy disk to another one. At first, access was through proprietary software distributed on a 5.25-inch floppy disk.