What's the largest internal hard drive you've fit into your PS4?

I took a Seagate Backup Plus 4TB drive, cracked the shell open to extract the drive, and then used tin snips to cut the caging to allow the taller drive to fit. 2 pieces of double sided tape holds it in place, the glossy cover fits over nicely, and after a quick OS re-install I had 3.58TB of storage space. Now I'm down to 2.20TB