The internal Zip 250MB ATAPI drive is completely compatible (read and write) with the millions of Zip 100MB disks out there today. But with the Zip 250MB drive you can also take advantage of Zip 250MB disks to get more than twice the storage capacity of Zip 100MB disks. Everything that makes Zip drives and disks so popular is there in the Zip 250MB drive. It's lightweight, fast, secure and dependable. And higher-capacity Zip 250MB disks mean that backing up all your stuff is easier than ever.