RAM that's needed to operate computer disk (5)

I believe the answer is:

drive

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'ram' is the definition.
(I know that ram can be written as drive)

I don't understand the rest of the clue.

(Other definitions for drive that I've seen before include "Ambition - steer" , "Operate or control a vehicle" , "Propel or compel" , "Be in charge of car in motion" , "Pilot a 4x4" .)

I've seen this clue in The Times.

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