Which of the following has the greatest storage capacity? DAT tape, QIC tape, CD-ROM, ZIP drive?
The most recent Zip Disks had a capacity of up to 750MB (though originally Zip disks only had a capacity of 100 MB, but later versions increased this to first 250 MB and then 750 MB).
CD-ROMs have a similar capacity around the 650-700MB mark (though it is possible to get CD-ROMS of up to 900MB).
QIC (Quarter-inch cartridge) tapes originally were released with a capacity as low as 20MB however the Travan (an evolution of the QIC Minicartridge format) has a capacity of up to 10,000MB (TR-5). The original QIC tapes however max out at about 525MB.
DAT (Digital Audio Tape) tapes have a storing capacity from 1.3 to 80 GB capacity and through the ISO Digital Data Storage standard it has been adopted for general data storage.
Therefore looking at the data I have to say that DAT tapes have the highest available capacity out of the options that you have suggested (though as your other poster has mentioned these are quite old methods and better options, such as say backing up from a virtualised image might be used these days instead).
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