Accidentally hit computer
The mechanical hard drive is the only product that doesn't like mechanical shocks. Well, nothing like mechanical shocks, but only part that's affected easily by them.
These days, they have acceleration and shock sensors so if it's a big enough bump or hit, those sensors would be tripped and the first thing a mechanical drive would do is to quickly park the drive heads outside the area of the platters, so that the heads won't vibrate and hit the surface scratching it or breaking loose bits of material.
Maybe that's what you heard, the mechanical drive parking / moving away its heads outside for safety.
Anything else doesn't care that much. I guess too bit of a hit / fall could cause a heavy heatsink / cooler to snap plastic retaining clips or screws going into a backplate could be popped out damaging the screw thread.
But this is extreme ... not a small bump with the elbow.
Look the following days with a tool like Aida64 or any other tool that lists the SMART information from your hard drive. Some rows there will tell if the drive was damaged in some way.

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