Expanding Hard disk

Hi Guys
I asked a similar questio before but didnt really find what i was looking for.
Is it possible ot create a virtual hard disk that dynamically expands, as opposed to being a fixed virtual hard disk.
Or can teh virtual hard disk file...be expanded, to suit? or is this a fixed disk/file , once created can not be modified?
Thanks

Check out this post on expanding disk space.
Re: How to extend / add disk space to guest VM?

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