Check the listing for details. Emtec 5.25" WORM Magneto Optical Disk 5.2GB 2048B/S MO (345615EUW). Condition: New. Listed at 15.95 USD. Emtec 345615EUW 5.25" WORM Magneto Optical Disk 5.2GB 2048B/S MO Each Emtec 5.25” WORM (Write Once Read Many) Optical Disk has a capacity of 5.2GB. The disk has 2048 bytes/sector and it is unformatted. The disk is packaged in a plastic jewelcase. 5.25-inch MO disks combine the qualities of high-speed random access and long archival life to suit a variety of applications. NEW AND FACTORY SEALED No returns accepted without authorization number. Contact us for return authorization instructions. Non-defective returns must be in original unopened packaging and will be subject to a restocking fee.