Yes, IBM had a 12" version.
Well I recall wokring on CP/M and MP/M machines and Intel development systems that all had 8" drives. Initially Shugart single sided drives, but as time went on, double sided, double density, high density and half-height drives became common. Of course once the IBM-PC popularised 5 1/4" drives it was all over for the 8" types.
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