Iomega 100MB Zip Disk 1 Pack - PC Formated by Iomega. $6.94. Iomega 100MB Zip Disks are durable, portable and secure. They can be password protected. This disk is formatted for use with with PC's but can also be reformatted to use with Macs. They can be used interchangeably with 100MB and 250MB Iomega Zip Drives. They are read-only on Iomega 750MB Zip Drives.