As mentioned above, HPFS was born with OS/2 LanMan. OS/2 was a joint venture between Microsoft and IBM to replace DOS.
This project dates back to the mid 1980's. While tension increased between the two corporations, the final rift occurred over the fate of the AT (80286).
IBM wanted to support the 286, and Microsoft insisted on leaving it behind, and set the baseline (minimum) with the 386.
They parted ways, with IBM creating its own GUI interface with TopView, and supporting the 286, and Microsoft working on NT (New Technology) that required a 386.
Today, there are few drives running HPFS.
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