Greens would work, but are limited to 5400RPM so your data transfer rate will take a hit with that.<p>Reds are WD&#x27;s &quot;NAS&quot; drives, with some advanced features, but the Segate ST2000DM001&#x2F;ST3000DM001 have worked very well for me with multiple years of almost constant data access.<p>Sidenote: the upgrade from 4x2TB to 4x3TB was extremely simple, I just failed my drives over one at a time, so as long as you do everything at once you can expand everything really easily with ZFS.