Customer Review

0 of 3 people found the following review helpful
4.0 out of 5 stars Slow data transfer as previously reviewed, August 17, 2011
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This review is from: ZyXEL NSA221 2-bay Network Attached Storage and Media Server (Personal Computers)
Pros:
Best value among the similar products.
Super fast shipping by Amazon.
Easy hard drive install.
Easy internet setup.
Convenient usb port for storage expansion.
Cons:
No direct usb connection to pc.
Internet access to the files is complicated to set up.
Slow data transfer. 180Gb data takes 3 hours for transfer from pc.
Some of the reviewers stated that the USB rate is only 1/3 of the Ethernet. However, I found the rate was only 8mb/s to 10 mb/s when copying my stuff to the ZyXEL media server when single pc utilize the intranet for copying, which is much slower than the usb transfer. My setting was one pc wired and one notebook wireless attached to the router (10/100mb). It will be great if somebody could point out the hints for optimizing the data transfer rate.

Media center has not been tasted yet.
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Showing 1-1 of 1 posts in this discussion
Initial post: Jun 20, 2012 6:12:09 AM PDT
Seth says:
You are getting the best your net can do. With a 100mb LAN you cannot use Jumbo Frames.

Also, compare apples to apples: You say you get 10MB transfer. That is 100mb. LANs are rated in mb (mega bits). The transfer shows MB (mega bytes). A byte is 8-bits. Add (simplifying here!) a start and stop and/or parity bit and you have 10-bits.

The other issue is what the PC shows is really not a true transfer rate; it is an average. You (I do) see some drives start at a high rate (as much as 25MB) then slowly drop. It is averaging.

USB 2.0 is, effectively, faster than a 100mb lan. And, don't forget you are bound by the transfer rate of the HDD itself (buffers, latency, read access time) and file sizes.
I hope this helps.
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