I was searching for the answer to this basic question before I bought my DNS-323. I was surprised at all the confusion surrounding this question, and all the answers from people running 100Mb networks. If you're only running 100Mb, I don't see the point in commenting about good speed. You're limited by your slow network.
Anyway, I've tested this and here are the numbers:
- 1Gb LAN is around 100MB/s (not Mb/s)
- Most desktop hard drives max out around 50 to 60 MB/s.
- My 1Gb home Lan: PC to PC I get between 30 and 60MB/s, regardless of jumbo frames.
- With the DNS-323, I can get ~30MB/s down with jumbo frames, maybe 25 or less down without jumbo frames.
- With the DNS-323, I can get ~20MB/s up (going to DNS-323).
At first I was pretty disappointed with these numbers. I finally came around to the realization that I'm okay with it. The device takes far less power than a PC, and even less when the drives sleep. So viewing it as a medium-speed, low power, always available, on line hard drive is not a bad thing, and it has a place on my home LAN. I'm thinking of ordering another one.