DUAL DISK MIRROR

COMPUTERS, COMPUTER PERIPHERALS AND COMPUTER PROGRAMS ALLOWING TO WRITE TWO DISCS SIMULTANEOUSLY AND TO BACK UP AUTOMATICALLY WITH THE PROVISION TO READ THE DISCS ALTERNATIVELY IN ORDER TO CONTINUE PROCESSING IN CASE ONE OF THE TWO DISCS FAILS; BLANK MAGNETIC DATA CARRIERS IN THE FORM OF DISCS AND TAPES; OPTICAL SCANNERS, PRERECORDED AUDIO AND VIDEO DISCS FEATURING ENTERTAINMENT; DATA PROCESSORS