Creating a spare disk will 'x' the need for more disk space.
What is the replacement for 'x' — I can think of 'prevent', 'negate', 'skip', but I am looking for a better word to convey that 'it will not require doing something'.
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There's the far more formal term obviate:
obviate: remove (a need or difficulty).
- The presence of roller blinds obviated the need for curtains.
But eliminate would be my choice, neither over- nor under-formal:
eliminate [verb] [formal]
To eliminate something, especially something you do not want or need, means to remove it completely.
Creating a spare disk will eliminate the need for more disk space.
Creating a spare disk obviates the need for more disk space.
obviate, transitive verb
To anticipate and prevent (something, such as a situation) or make (an action) unnecessary
The new medical treatment obviates the need for surgery.
The virtue of obviate is that it not only does away with a possible need but anticipates the need and avoids it.
remove verb [ T ] UK /rɪˈmuːv/ US /rɪˈmuːv/ (TAKE AWAY)
B1 to take something or someone away from somewhere, or off something:
Creating a spare disk will remove the need for more disk space
Resolve. Oxford English Dictionary, "resolve, v.", 17.a.(a):
transitive. To answer (a question); to solve (a problem of any kind); to determine, settle, or decide upon (a point or matter regarding which there is doubt or dispute).
Since the action in the subject ("creating a spare disk") will resolve the situation in the object ("the need for more disk space"), no other action will need to be taken.
As someone that's been working in the industry for a very long time, "Creating a spare disk will eliminate the need for more disk space" sounds weird. It works in some circumstances, but those are quite limited.
It sounds like a user needs to make a choice between two installation procedures requiring different amounts of disk space. If so, I wouldn't use a sentence of the form you presented. I would say
Creating a spare disk will reduce the amount of disk space needed.
If it's disk space that's already being used that would no longer be used, I would say
Creating a spare disk will free some disk space.