Now that I think about it...
In my opinion, the only thing that makes a CD more likely to survive a drop than a (3.5") HDD is weight. Because the HDD is heavier it will fall faster and hit harder. I think if you drop identical objects ONTO the storage medium, a HDD will more likely survive than a CD.
Smaller HDDs are lighter, and they adopted load/unload ramps before most desktop drives did. But that didn't stop people from breaking 1" Microdrives.

The smaller drives also use glass platters, which obviously can shatter from extreme shock, rendering the data unrecoverable. But then again, you can make CDs unrecoverable simply by scratching the label side.
(I'm talking about stopped HDDs, of course. You can quite easily render data unrecoverable with shock applied to the spinning HDD, resulting in a head crash. But as long as the HDD is off, short of shattered platters, you can at least send it to a data recovery company, though that won't be cheap.)
(I know the IBM 75GXP also had glass platters and load/unload ramps, but it shouldn't even be used as an example.

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