it wasn't uncommon back in those days, I spent a bunch of years porting Unix to various pieces of hardware in the mid to late 80s. Disk drives that required you

it wasn't uncommon back in those days, I spent a bunch of years porting Unix to various pieces of hardware in the mid to late 80s. Disk drives that required you to build an entire sector image (including headers, trailers CRCs/etc) to be DMA'd at the device when triggered by a passing sector mark were common