On Fri, 7 Feb 2014, David Gesswein wrote: Indeed; 8" platters, a 'real' voice coil and a transparent cover to let you watch the action. As a matter of fact this weekend I'm planning to see if I can revive a 7710. --- On Fri, 7 Feb 2014, Steven Hirsh wrote: That's interesting; are you sure that 5021Hs are ST-412 drives? The 5021H drives that I have all have the IMI interface and almost definitely came Some of the 5 1/4" IMI drives were available in both versions for a while, with the IMI interface or the ST412 version (as well as a custom 'raw' version) and conversion kits were even available, but I always assumed that the original model numbers would be different. FWIW AFAIK their first 5 1/4" drive was the 5007, unusual in that it was in a plastic chassis and used an external optical index sensor; many fond memories of having to clean out dust and realign without losing client data... I also have an IMI interface 5018H but don't recall what its specs are. I'd be surprised but it's certainly possible; Corvus and IMI were closely connected ever since Corvus began with an 8" 77xx-based hard drive cabinet for the Apple ][, and in fact they ultimately merged.