The revolutionary M-Disc is a format designed to last centuries, making it perfect for reliable lifetime archiving. Unlike traditional disc formats, these Blu-ray M-Discs have an expected mean lifetime of 1,332 years - ideal for family photos, videos or important business data. They can be written to and read by most current Blu-ray drives. Archival recordable Blu-ray disc: designed to last at least hundreds of years M-Disc BD-R (Recordable): write once, read many times Durable M-Disc recording layer resists light, temperature and humidity for centuries Can be written to and read by most modern Blu-ray drives Printable surface for compatible inkjet printers Recording speed: 4x Supplied on a spindle of 10 discs Capacity: 25GB