The "25 worst" list made me remember the Pereos tape drive--backed up about
1 GB (compressed) onto tiny postage-stamp sized tapes.
Here's one cheap on e-Pay:
http://tinyurl.com/pczbk
I first saw one of these things in 1994, when I was contacted by the
company to include support for the thing in one of our forensics products.
After 2 weeks of struggling to get it working so that I could actually read
tapes that were written by it at least some of the time, I sent the sample
unit back with a polite refusal.
For those collecting oddball vintage media, this definitely fits the bill.
One couldn't go to, say, Fry's and buy tapes for it either--you had to call
an 800 number and wait for Fedex to deliver them.
I think Datasonix sold these units up until about 1998.
Cheers,
Chuck