For the first time in decades a new disc format has been launched without a format war.
Sony and Panasonic have developed a disc format for archiving data that starts at 300 GBytes and runs up to 1 TByte.
The write-once technology (which used to be called WORM -- write once, read many) is a double-sided, three-layer disc written by a 405 nm laser. It uses Reed-Solomon encoding, writing data in 79.5 nm bits on a track pitch of 0.225 micron.
The two companies have agreed on a crosstalk cancellation format that electrically removes crosstalk from the adjacent tracks. This crosstalk increases as the track pitch becomes narrower, so the cancellation allows higher quality playback performance. They have also added Partial Response Maximum Likelihood (PRML) signal processing that takes inter-symbol interference into account, again allowing the discs to reach the 1 TB capacity.
Datacenter operators have been struggling with the long-term archiving of data, particularly images. Using archive discs cuts the power consumption against storing infrequently accessed data on hard drives. In recent times, demand for archival capabilities has increased significantly in the film industry, as well as in cloud datacenters that handle big data, where advances in network services have caused data volumes to soar, says Sony.
Facebook, for example, has developed a storage system that uses 10,000 Blu-ray discs to hold 1 PB of data. This uses a rack of 24 magazines, with each magazine holding 36 cartridges and each cartridge holding 12 Blu-ray discs, for a total of 10,368 discs. A robotic picker goes to a specified magazine and then locates a cartridge and selects a specific disc.
Currently a prototype, the company is looking to share the design with the Open Compute Project to get it into production, as it cuts the cost of storage by 50% and the cost of power by 80%.
The archival discs will also allow inter-generational compatibility between different formats, ensuring that data can continue to be read even as formats evolve. This makes them robust media for long-term storage of content, recognizing that optical discs will need to accommodate much larger volumes of storage going forward, particularly given the anticipated future growth in the archive market.
Sony and Panasonic each aim to launch systems with a recording capacity of 300 GB per disc starting in the summer of 2015. In addition, both companies plan to leverage their respective technologies to further expand the recording capacity per disc to 500 GB and 1 TB.
This story originally appeared on EE Times Europe.