The hard drive event would have been in about ‘85. That was my employer’s PC that we’d upgraded from dual floppy to single floppy and the HDD.
I bought an original IBM-PC 5150 in the Spring of ‘82 on a student discount plan. Took out a small loan, I think the system was about $3500. 2 FDDs, 64k RAM soldered to the motherboard, 5151 green screen monitor and card. Another 64k on a Quadram Quadboard that also got me a serial port, a parallel port, and a clock. Epson MX-80 dot matrix printer.
Those were the days! Hey, I no longer had to go to the computer center on campus!
We began selling them pretty soon after that, got a call from the Concord, CA District Attorney to help them set up a network in their offices, about 3 months after we got our first computer, we declined didn't know anything about it. In that area of CA, everybody wanted a computer.