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Blu-ray media can be written to once, which is not rewritable for censoring and virus
Archive from production hosts, production storage, and backup storage. Blu-ray media is permanently downward-compatible.
Blu-ray media can serve up to 50 years, not requiring regular dumps. It has low requirements for physical environment, and can resist electromagnetic interference. In addition, it does not need special environment at constant temperature and humidity. Its energy consumption is over 20% less than that of the library.