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Then think about how a hard drive works. It's very similar to an old vinyl record player - the head (needle) FLOATS above the platter (disc) by microns - the bump and shake of a car in motion is enough to jerk, jog and throw the head all over the place; in extreme cases, even crashing the head onto the disc itself causing terminal disc failure.
Read around on options of suspending your disc via bungee cords or other cushioning structures rather than strapping it down solid, unless you've cushioned the whole PC in the car against shakes and knocks.
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