Got myself a Seagate 5TB 2.5" HDD. It's amazing they were able to pack 5TB into that form factor, although it is 15mm. I swore I wouldn't put a spinning drive in my PC again, but I needed storage, so... it's going outside. This way I can also use it with my phone and laptop. The advantage of the 2.5" form factor is that it can be powered by USB, and it's also much smaller and lighter. The enclosure I got looks really good next to the M1 too, it's like they were meant for each other. Equal amounts of fingerprint-proneness too.