@DaveA66 yes you are right on this.
We reconsidered it and 10G is way to low to have a professional system installed on and with good performance.
A good average in order to have some updates installed (OS I mean) and some recordings/vmails and keep is stable,
its around 50G.
Because if the disk starts filling up, then performance will also go down of everyting.
But you may use Marketplace image and set it up accorging to your needs as our friend metioned above !!