there's also the option of extending your current partition with space from another drive!
This is what i did recently and it works wonderfully easy.
AC was installed on D: drive (1TB SSD), and was running full... I installed an extra 1TB SSD and from that I allocated some space to drive D. I enlarged it so to speak.
This is very easy to do via Disk Management in Windows.
Here is how it looks afterwards, notice the purple parts (D drive) is spread over 2 physical SSDs:
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Just press Windows button and start typing "create , you will see this :
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it will open the Disk Management (from screenshot above).
In there right-click on your partition that holds AC and select "Extend Volume".
You should have none allocated space on another drive in order to do this extend obviously,
so best is to buy a new SSD and put it in your pc before going in Disk Management... then you can allocate all or part of that new fresh space to the partition your AC is residing on already. (I choose to allocate only part and create a new E partition with the remaining space, but I could have assigned all 1TB to my D drive as well).
Big advantage of doing this :
1) No need to move over all your AC content to a new drive, and
2) no need to buy a bigger drive (1TB SSD would do fine and is cheaper)