We run through seven different durability tests on the Sony optical disc archive (ODA) cartridge. Gen 3 media can store 5.5TB on a single cartridge. The Cartridges can be accessed in a single USB drive or larger robotic library called the Petasite.
Sony Optical Disc Archive Petasite Library demonstration. The library uses 5.5TB Write-Once Optical media and can scale to storing Petabytes of data for 100's of years.