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Priti, the IBM PC-XT, introduced in 1983, was indeed the first IBM PC model to include a built-in hard drive. The hard drive that came with the PC-XT was the IBM 5160 Model 066. It featured a Seagate ST-412 hard disk drive with a storage capacity of 10 megabytes (MB).
The IBM Personal Computer XT (model 5160, often shortened to PC/XT) is the second computer in the IBM Personal Computer line, released on March 8, 1983. Except for the addition of a built-in hard drive and extra expansion slots, it is very similar to the original IBM PC model 5150 from 1981. It had a storage of
10-20 mb and memory of 128-640 kb.