The unit of measurement inch is used in many areas of information technology. For example, in monitors and racks, floppy disks, hard disks and connectors, connectors and packages, magnetic tapes, tape drives and graphic resolutions, memory densities and font sizes.
Known inch dimensions for magnetic disks, hard disks and floppy disks are 14", 8", 5.25", 3.5" and 2.5"; racks and rack inserts are usually 19". In addition to the inch unit of measurement, the smaller milli inch is also used as a unit of measurement. One milli inch (mil) corresponds to one thousandth of an inch and has a length of 25.4 µm. This unit of measurement is used, among other things, for SMD components, for racks, subracks, printed circuit boards, striplines, pitches and microstrips, and also for the module widths of bar codes.