8TB HDD requires more power than small form factor supports  
Hi, I am looking to purchase a second hand machine to primarily record and manage my home surveillance footage. I want to be able to run the OS and software on an SDD and then install an 8TB HDD to store all the camera footage on. For future-proofing in case I need to expand storage, it would be good if the machine had space to add a second HDD. Am I right in thinking that if I want to keep the form factor as small as possible but meet my requirements, I need to be looking at the mini tower form factor?
Which form factor do I need to look for?