How fast is USB 2.0 transfer rate?

TaiDinh

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Joined Jan 30, 2007

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Discussion starter · #1 · May 21, 2008

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I just got a 320GB SimpleTech EXHDD: 7200RPM with 8MB of cache.

I am transferring 90GB of data at once to it and it is doing 25.6MB/sec. Is this rate of speed normal? Taking 40 minutes total to transfer everything.

 

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Manyak

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Joined Mar 14, 2008

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#2 · May 21, 2008

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Quote:

Originally Posted by TaiDinh I just got a 320GB SimpleTech EXHDD: 7200RPM with 8MB of cache. I am transferring 90GB of data at once to it and it is doing 25.6MB/sec. Is this rate of speed normal? Taking 40 minutes total to transfer everything.

Max USB 2.0 connection speed = 480Mbps = ~48MB/s

But yeah USB hard drives are slow. The USB controller has to wait for the drive to say "ok ready" before it sends any data, which means waiting for every few bytes to be written.

If you have the option to, hook it up on firewire or eSATA. It will be faster.

 

shinji2k

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Joined Jun 25, 2007

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#3 · May 21, 2008

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480Mbps = 60MB/s

But yes, ~25MB/s is what you should be seeing.

 

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Manyak

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Joined Mar 14, 2008

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#4 · May 21, 2008

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Quote:

Originally Posted by shinji2k 480Mbps = 60MB/s

.....oops

 

TaiDinh

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Joined Jan 30, 2007

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Discussion starter · #5 · May 21, 2008

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Sounds good. I was worring that it might have been slow. And nope, I'm not able to use firewire or eSATA.

So far, the EXHDD is pretty good. Pretty quiet, but it is big. ><" Oh well, I need the space.

Thanks all.

 

shinji2k

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Joined Jun 25, 2007

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#6 · May 21, 2008

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Hehe, it's ok

. Manyak is correct about there being a lot of overhead, taking a good chunk out of the theoretical max transfer rate. eSata is nice to have but does require a new enclosure.