DUAL DISK MIRROR

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