Ooops. That should state 25MB/s write and 40 MB/s read
I have several thecus NASes (http://www.thecus.com/) the N5200, the N5200Pro and I'm looking into a N7700 or a N8800. They all have Gigabit ethernet connections. They are more expensive than purpose built boxes - but they are "set it and forget it" appliances - which is where there value comes from.
I can sustain approx 25MB/s write and 40 MB/s on my N5200. NOTE: That's bytes not bits. In otherwords 200Mbit read throughput and 320Mbit write throughput. This is far better than the other domestic of SOHO NASes - which is why thecus tends to win awards http://www.thecus.com/news_contentx.php?nid=827 , http://www.tomshardware.com/reviews/holiday-gift-guide,2065-12.html
If you contrast this with one of my windows RAID arrays (100+MB/s read 100/MB write - array to array or just streaming) it looks rather poor.
If you want something that you can just forget about and will give reasonable performance then TheCus is what you want
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