My BI pc is a SFF Dell Optiplex 5060. It has a 512GB SSD and nothing else for storage. Currently everything saves to the SSD and then files are transferred to a USB attached external hard drive. I don't record continuously, but I want to start so I need to add a hard drive. Looks to me like I can add a 3.5" HDD (does it just click into the blue tray?) or do I need to open up some more space for it by removing the CD drive which I never use? If that's the case do I just not use a tray at all or is there a different tray I need to buy? There are two cables available at the bottom of the tray and it looks like they plug directly into a new HD?
I've seen recommendations for the WD Purple drives. Is there a max storage size these machines can handle (4TB, 8TB, etc)?
Picture of my PC's internals attached.

I've seen recommendations for the WD Purple drives. Is there a max storage size these machines can handle (4TB, 8TB, etc)?
Picture of my PC's internals attached.
