Iomega's Zip drive.

Iomega produced a high density drive prior to the days of CD/DVD burning at the desktop.

They still do.

They were either external parallel, serial, or built into the machine.

You can see their current products here.

We had two of these a few years ago as they appeared to be a great solution for data backup and portability. Unfortunately, neither lasted more than a couple of weeks before dying. Personally, I feel they were very poorly designed and I'd never buy another one.

There are better ways to store data, so I'd suggest extreme caution.