I think I still have a few 3 1/2" and even 5 1/4" around here somewhere. I even had a 120mb Superdisk drive. I bought it used and got 4 or 5 years of use from it. It could hold 1000’s of CNC programs and even CAD drawings.

***Great Googlely Moogely! You can still get Super disks on eBay!