Introducing the Rewritable 5.25-inch Magneto-Optical Disk, 1300MB, preformatted, 1024 bytes per sector, by Imation. In today’s computer environment, massive data storage is a requirement. And when it’s your data, the first bit is just as important as the last. That’s why you should trust your data to Imation optical disks. Imation optical disks combine high capacity, convenience and cost effectiveness with exclusive patented features and total reliability. Each Imation 5.25-inch optical disk comes in its own interlocking library case for easy, space-saving storage.