I suspect one of my Seagate drives in my first 323 is actually beginning to fail. It's been reported as "removed" a couple of times, but every time I scan the disk it claims to work perfectly, and the rebuild always works. I don't wanna have to rely on that disk though so I'm gonna replace it, but maybe I should replace it with a bigger one that's low-energy and 5400RPM instead so when the other fails I'll have a bigger NAS. Will the RAID work with different sized disks until then? And will it let me make a non-raided volume of the extra .5Tb?