3.5" disks. They were so rugged compared to 5.25". Installing OS/2 with 11 or 12 of them. A few years later using the internet for the first time (university

3.5" disks. They were so rugged compared to 5.25". Installing OS/2 with 11 or 12 of them. A few years later using the internet for the first time (university green/black unix terminal running netscape), loading something I'd heard of called Amazon using my first credit card. Getting a CD delivered two weeks later from the US. The world instantly got a lot smaller.