Interesting observation (second one I've encountered like this, the first wasn't photographed):

Notice the second layer of metal, that's not attached to anything except the main mechanism's frame. This one's not the best example, it's got what appear to be screw-holes, but I assure you (as best I recall) they weren't attached to anything. I've another I took apart which didn't have screw-holes. It's just a slab of metal mounted by them rubbery-things and attached to nothing else.

So what's it do? It's can't be particularly structural. It seems to be a weight, I guess, mounted via "springs"... a dampener, I guess. Not unlike the ones mounted atop skyscrapers to prevent sway during wind/earthquakes...? Kinda shocking it'd have *that* much effect as to be justified... What's it dampening, unbalanced discs spinning at high-speed? The stutter of the stepper motors (erm... this one uses a DC-motor, the other had a stepper)? And, think, both the reader-mechanism AND the disc's motor are attached to the drive's frame via much "floppier" rubbery-things... so, if the disc wobbles or the steppers stutter, then *this* dampener's effect is to attempt to keep the overall system more stable while imparting *most* of the wobble into the actual mechansim itself... (?!) So, WRT the drive's housing, the disc and read-head will be inclined to move about quite a bit, no? I don't quite get it.

Ideas?