The cost of storing data on Everspan is lower than the $0.05 to $0.06 per-gigabyte cost for hard disks at the rack level, claimed Schellong, though he didn't provide a specific amount.
The optical backup system is more reliable than tape or hard drives and there is lesser chance of data failure, Schellong said. The storage media is never touched, unlike hard drives or tapes, giving it a longer life.
For reliability, Everspan borrows technologies from magnetic drives. Such technology includes erasure encoding, which is key to ensuring data integrity.
Sony and Panasonic will be the only companies manufacturing Archival Discs, and that's partly to ensure quality control so media can meet the 100-year guarantee. The companies want to avoid mistakes made with consumer technology like Blu-ray, where discs frequently were marred by production glitches.
"We want to avoid this," Schellong said.
The optical drives work on the SATA interface, but convert the signals to the iSCSI protocol. Everspan has interfaces so tape drives can be used in the system.
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