Ideal for data backup and archive, Fujitsu 3.5" Magneto-Optical (MO) disks are resistant to problems that plague traditional magnetic media - such as shock, vibration, moisture, dust and magnetic fields. Enclosed in a durable, floppy-sized cartridge, each fully rewriteable MO disk delivers 50-year data archival life (based on ANSI/PIMA IT9.26-1997) and comes with a lifetime Limited Warranty.