From the Manufacturer

Iomega Corporation provides easy-to-use, high-value storage solutions to help people protect, secure, capture, and share their digital valuables. Iomega's award-winning storage products include the popular Zip 100 MB and Zip 250 MB drives and the Zip 750 MB drive.

All Zip disks are pre-formatted, protected by a rigid plastic shell, and offer shirt-pocket convenience. Zip disks are durable and can easily shrug off the bangs, bumps and scratches that can ruin CD-R and CD-RW discs. And, because Zip disks are inherently rewritable, users don't have to stock one type of disk for write-once operations and another type for rewritable operations. The same Zip disk does it all with superior rewritable performance and durability.