Not quite "picked up by magnetic film", but nowadays it's very common do use things like KryoFlux, which essentially reads the magnetic flux changes on a very low level, and therefore provides a very detailed (for almost all intents and purposes: 100% faithful) image of the actual disk. Not just its filesystem or any other higher level.

Reading in a disk drive is also usually entirely nondestructive (barring any mechanical issues), so that's a very good solution already.