Sony EDM640C magneto optical disk

EDM640C2, 8.89 cm (3.5 ") MO, 640 MB, 2048 Bytes/Sector, Rewritable Sony's optical media are 3.5-inch discs compatible with a wide range of optical drives. They're treated with Sony's advanced polycarbonate substrate for extra durability and shock resistance. They support ISO standards and are tested up to 50 years of proven media life thanks to Sony's optimized recording layers and recording particles.