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[–] 1 pt

That's a Seagate ST-412 full-height MFM (pre-RLL) drive, and was brand new for the 1981 model year. It should conform to ESDI.

[–] 1 pt

Oh, so XCOMP was just a reseller.

[–] 1 pt

Yes. The sold the bare drive with controllers for various systems, along with software to access said drive. S-100 bus was the most popular until IBM force-fed ISA to the public.