My first PC was a first day ship IBM PC-1 that cost about 2 grand (employee price) with two 128k diskette drives, a tape recorder "mass storage" and a whopping 64K of RAM. (Epson dot printer and mono monitor)
Several years later I did the $300 WDWX1 controller/ST238 upgrade to a hard drive but that also required a new system board. My old one suddenly just "went bad" and I had to replace it on the M/A ... funny how that works huh? I had a problem earlier with one of those diskette drives and needed a new one too. They only had the 360K. ;-)