During the peak of removable storage, "RW" and "Zip" were frequently mentioned together in reviews of hybrid drives or early backup software: Iomega ZipCD Go to product viewer dialog for this item. Reviews : Users often looked into the Iomega ZipCD

were reviewed for their ability to print directly from multiple media formats, including CD-RW and Zip disks [17]. Software & File Management

In a software context, "rw.zip" or similar naming conventions were sometimes used for utility archives: