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USB drive connection speed at ~3MB/sec, is it normal?

 
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February 21, 2011 11:05 AM
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oldgromit

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Hi all,

I flushed to the latest DD-WRT Kong Mod, I attached an external USB hard drive. I can move files between the drive and my desktop, connected via a 1Gbps network. However, in Windows 7, I noticed the transfer speed is only 2.5-3 MB/sec (Notice it's MB, not Mb). I measured by transfer a 5GB file  and click on More Details to check the transfer speed. I understand there's overhead, but it's not anywhere near the speed I was expecting. Shouldn't it be around 80MB/sec?

Is this normal, anything I can do to improve transfer speed? What transfer speed others are getting?

Thanks!

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Generic Member Avatar
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  • member since: 01/23/2011
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  • 2 comments
March 24, 2011 4:15 AM

I got pretty same results. For me it seems that it's fault of USB implementation - if you check hdparm -Tt, it yields some 15 MB/s, that's our theoretical limit. You bring Samba and 1 Gbps routing features, drops to ~4-5 MB on read and some 7-9 MB on write. Pretty much nothing we can do about it - or so it seems.

Kong Avatar
Member
March 25, 2011 5:54 PM

This comes from the fact, that routing is done in software on these units, basically routing consumes a lot of the cpu power which does not leave much for samba, I/O. etc.

Discussion:    Add a Comment | Comments 1-2 of 2 | Latest Comment

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