The ThinkPad Zip 250MB UltraBay 2000 Drive lets you store up to 250MB of data on a removable Zip data cartridge. This drive is also backward read/write compatible to the industry standard Zip 100MB media. You can backup, transport, consolidate, organize, and offload valuable data from the Internet, your network, or ThinkPad hard disk drive. ??The ThinkPad Zip 250 MB Ultrabay 2000 Drive is supported for use inside the IBM Portable Drive Bay 2000 and the IBM Dock.