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@badtmy
d-locks are easy enough to smash with a car jack (as any serious thief knows).
at least the big fat abus granit locks (and high-rated reinforced chains) can't be removed in this manner, they need an angle grinder or some other powered cutting tool.
however, a serious bike thief will bring his own tools and have your bike in no time, if they really want to. locks are really only a delay mechanism for professional thieves and a deterrent to casual ones.