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Windows 7: Slow Data Transfer Rate

29 Jun 2011   #1
ZJE123

Windows 7, Windows Vista
 
 
Slow Data Transfer Rate

I am planning on re-installing Windows 7 onto my computer to clean it up a bit. I have a 1.5tb external hard drive plugged into a usb hub, which is plugged into my computer. Whenever I try to copy files to my external hard drive, the transfer rate is extremely slow. When I start, it is about 10mb per second, then over time, it slows down more and more until finally it sits at about 40kb a second, which is extremely slow when copying gbs of data. USB 2.0 is supposed to transfer up to 600mb a second. I know it probably wouldn't be that fast but, I don't expect it to be in the kb range either. Any ideas about why this happens and what I could do to fix it?


My System SpecsSystem Spec
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29 Jun 2011   #2
logicearth

Windows 10 Pro (x64)
 
 

USB is a shared BUS and shared CPU system. That means it will never reach its maximum speed more so if the CPU is under heavy usage. Also depends on how fast the External HDD can preform.
My System SpecsSystem Spec
29 Jun 2011   #3
Seeliewight

Windows 7 Ultimate x64 SP1
 
 

True enough, but under light CPU load (only background programs running) I could see 6-8 MB/s of transfer speed from to an external hard disk. This was on a laptop with an old Core2duo processor.

I use Teracopy to do the file transfers - it has a verify mode where it checks the source and destination to make sure the copy went through clean. It also claims to speed up copy by buffering both IO paths - I'm not sure how much that helps, but you may want to take a look at it.
My System SpecsSystem Spec
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29 Jun 2011   #4
brady

 

attempt bypassing HUB, check perfmon for drive I/O statistics.
My System SpecsSystem Spec
29 Jun 2011   #5
ZJE123

Windows 7, Windows Vista
 
 

Quote   Quote: Originally Posted by Seeliewight View Post
True enough, but under light CPU load (only background programs running) I could see 6-8 MB/s of transfer speed from to an external hard disk. This was on a laptop with an old Core2duo processor.

I use Teracopy to do the file transfers - it has a verify mode where it checks the source and destination to make sure the copy went through clean. It also claims to speed up copy by buffering both IO paths - I'm not sure how much that helps, but you may want to take a look at it.
Yea, I'm using a core 2 duo processor, but I'm sure that the hard drive is rated over 40kb a second too, so I'm not sure why it slows down so much, I could deal with 6mb a second, but not 40kb.
My System SpecsSystem Spec
29 Jun 2011   #6
Seeliewight

Windows 7 Ultimate x64 SP1
 
 

Quote   Quote: Originally Posted by brady View Post
attempt bypassing HUB, check perfmon for drive I/O statistics.
This is a good suggestion, and might actually be your problem. Plug in the disk directly into the laptop, and check the speed.
My System SpecsSystem Spec
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 Slow Data Transfer Rate




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