Funnily enough I've come across two of these recently, all 9GB IBM 50 pin models - one is great in my 840AV, the other in an external Apple HD case (which originally housed a 20MB model). Nice and quiet, speedy - worth seeking out.

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I definitely have to agree! The Seagate 9 GB 50 pin drive in my LC 475 is really quiet and fast. I'd like to get one for my 7100/80, but they haven't shown up on eBay for a while now. I'm considering just picking up a 68-pin drive and an adapter.