Answer: IBM PC XT
Older geeks well remember a time when booting your entire computing experience off of a floppy disk—and not off of a permanent hard disk inside the machine—was the only option for home computer users.
All of that changed with the 1983 introduction of the IBM Personal Computer XT, IBM’s successor to their early-1980s offering, the IBM PC. The IBM PC XT offered something that no other consumer computer had ever offered before: an internal hard disk drive.
One 10 MB hard disk drive, massive and pricey for its day, came standard with every IBM PC XT. But that’s not all the $5,000 MSRP got you though. The machine also shipped with 128 KB of RAM, a 360 KB double-sided 5-inch floppy drive, a monochromatic CRT monitor, and one of IBM’s beloved Model M mechanical keyboards.
Source = “https://www.howtogeek.com/trivia/which-computer-was-the-first-to-come-standard-with-a-hard-drive/”