There are the electronic formats including diskettes, CD-ROMs, DVDs, and the various Internet or Web-based versions. Not so long ago, the distribution of data sets in the form of diskettes was thought to be a wave of the future but technological changes brought problems. The standard size diskette or "floppy" was 5 1I4-inch square which then became the current 3 1/2-inch diskette. Although sm aller in size, the second diskette could be manufactured as high density resulting in a capability of storing a great deal more data. For obvious reasons, the two are not compatible.