The LTA-1 was a super-redundant storage system built upon standard desktop disk drives. It was based on our own disk controller with Erasure Coding, Digital Audit and hardware WORM sealing. Through Erasure Coding, data was distributed over 3 locations in Switzerland, providing 9-fold redundancy. Digital Audit regularly scanned the complete content on the disks for bit-flips and disk errors and initiated the shutdown of that particular disk drive. Erasure Coding, Digital Audit and hardware WORM sealing are still the core technologies of our archiving products.