Computer and data processing equipment, namely personal computers, computer disk drives for use with floppy discs, computer discs, digital video discs, storage disks and parts thereof; [ electronic data input equipment and output equipment, namely computer printers, graphic projection screens, keyboards, electronic drawing units, namely computer mice, graphic tablets and optical scanners; ] machine readable blank magnetic data carriers and blank magnetic and optical data carriers used with computer software and computer programs to read, write, and erase magnetic data carriers and magnetic optical data carriers with read and overwrite capability; computer operating programs for machine readable magnetic data carriers and magnetic optical data carriers, namely computer storage disks, floppy disks, computer disks, CD-ROMs, digital video disks; blank compact disks for read and overwrite of data and pre-recorded compact disks featuring audio data, image data, video data, text data, documents stored in ASC II, ANS I or a markup language, database data and program codes; computer programs for formatting and preparing blank magnetic and blank magnetic optical data carriers