Manufacturer: SONY Product: 3.5-inch Magneto-Optical Disk (MO) Used, 5 disks The plastic cases have some scratches. Label stickers and index cards are not included. Writing and reading are OK, formatted. Recording capacity: 1.3GB 2048 bytes/sector Logical format: None Standard: Compliant with GIGAMO standard (cannot be used with drives that do not support this standard)