

I remember seeing IDE drives all the way up to 1TB. Anything over 80GB was pretty uncommon though.
I had some 320GB IDE drives in my nForce2 chipset Socket A system, which thanks to the southbridge used on the motherboard, I had USB2.0 but no SATA support.




USB2.0 is considerably slower than an internal IDE drive. USB 2.0 is 480 megabit/s, and the final generation ATA 133 spec is 133 megabyte/s, which is around 1065 megabit/s, so over twice as fast. Ditto for things like latency. While the hard drives of the time physically couldn’t saturate a PATA connection, the difference in speed was still easily noticed.
At the time, if you wanted a fast external drive you used Firewire, which I actually did. I had several drives that were Firewire 800 but also included USB2.0 to connect to computers that lacked Firewire. I don’t recall if any of my motherboards that have Firewire built in can boot off of it but I kind of doubt it.
Later we had eSata for a brief period of time. I still miss it as it’s not as fast as USB3.0 which is the only option even today on many new external drives.