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Is the data format written on the disc an industry standard format? For example if you wish to archive information for 50 years, you want to use the most common and open supported standard. Currently this is UDF, Universal Disk Format which is the defacto standard for storing files on optical media. It is an implementation of the ISO/IEC 13346 standard (also known as ECMA-167). It is considered to be a replacement of ISO 9660, and today is widely used for (re)writable optical media. UDF is developed and maintained by the Optical Storage Technology Association (OSTA).
With the escalating cost of electricity and the increasing threat of power outages, the philosophy of keeping everything spinning forever doesn't make financial sense, especially if archiving for 5 - 50 years. Optical technology is ideally suited to archive infrequently accessed or static information. Most solutions which we provide have a disk cache on the front-end to improve searches and performance. Blu-ray as an archiving technology has a TuV certification of which is lowest energy consumption of all data storage technologies.
All companies today offering archival storage, use accelerated testing results to prove the media used will be stable in 50, 100 or 200 years. Therefore we can only base any archive technology on this accelerated testing, otherwise nothing would be sold.