From Windows I had a HP 6730b notebook, so some lousy 5400 2.5" disk probably, I don't even care. Still 10-12 MB/s is slower than USB2, so that's clearly an issue. My Mac has a WD15FALS disk, 7200 with decent cache. To a Windows server my copy was about the double. The network is Gigabit, cables are Cat6. NIC speed is auto, auto-negotiated to 1000/full. No cache drive in the unRAID server obviously.