Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: USB3.0 transfer (low) speeds??

21 Oct 2017   #1
martinlest

Windows 7 Home Premium SP1 64-bit
 
 
USB3.0 transfer (low) speeds??

So many articles online on USB speeds of course, but I still can't work out why I have such low transfer speeds, or whether, under the circumstances, this is what I should expect in practice. Can anyone advise please?

I currently have two USB3 HDDs (1 x Toshiba 2TB & 1 x LaCie 5TB) connected to my PC and am copying files (lots and lots of files of mostly similar size - c.11MBs each. About 1.5TBs in total) from one to the other. My PC drives are two SSDs (Evo 850s 500GB each). The O/S is Win7 x64 (which I recall reading has issues in this kind of thing?). M/B = Asus H97I-PLUS

I use TeraCopy to transfer files, and the window shows around "2 MB/s" to 6MB/s". When I start up the speeds are faster, up to 40MB/s but soon slow down, which I am assuming is Win7? I do get bursts of higher speeds, c.25MB/s, sometimes up to c.45MB/s, but they don't last more than a few minutes.

I have checked Device Manager, which shows (Intel) USB3.0 enabled and the drives both show as 'Superfast' in USB Tree View (and similar) and as being connected to a USB3 port.

What speeds should I be seeing in the above circumstances? I read of USB3.0 capable (in theory) of ten times what I am seeing...

Thanks.


My System SpecsSystem Spec
.
21 Oct 2017   #2
Megahertz07

Windows 7 HP 64
 
 

Believe me, I already done a lot of tests.
The bottle neck isn't the USB 3.x. The bottle neck is the disk.
The start up the speeds are faster because of the RAM buffer on the USB disk.
I have a External USB 3.0 case and only got high speeds with a SSD on it, and the results were the same with USB 2.0 Ports.

USB - Wikipedia
USB 2.0 = 480 Mb/s = 60 MB/s
USB 3.0 = 5000 Mb/s = 625 MB/s
USB 3.1 = 10000 Mb/s = 1250 MB/s
My System SpecsSystem Spec
21 Oct 2017   #3
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

Thanks... To be honest, I never understand the USB3.0 625MB/s given speed. What is that unit exactly? You surely can't move 1GB of data in under 2 seconds?? Is my average of about 4MB/s the best I am likely to get over a long transfer then?

Quote:
the results were the same with USB 2.0 Ports
:) You know, I quite often move large transfers across to another PC which dual boots into Windows XP. Even though it only has USB2.0, I usually get much faster transfer speeds there than using USB3.0 in Windows 7. I may leave it running overnight on the XP PC to see if it finishes. On my main PC, the time left is still measured in days! (Has been at just 1MB/s for a few minutes - now it's transferring at 32MB/s, but the faster rate rarely lasts longer than a minute or so. I wonder why these jumps in transfer rate? Why would the buffer dictate that? The files being moved are all more or less exactly the same size and format, 11MB .dds files, after all).
My System SpecsSystem Spec
.

21 Oct 2017   #4
LMiller7

Windows 7 Pro 64 bit
 
 

The USB3 bus transfer rate is in theory about 625 bytes/second. However, as with all serial protocols, there is some overhead so in practice the real maximum rate is about 500 MB/s. But that is just the interface between the drive and the computer and says nothing at all about the capabilities of the drive itself. Ads for USB drives usually don't mention that. Only a fast SSD can match that speed with conventional drives much less.
My System SpecsSystem Spec
22 Oct 2017   #5
Megahertz07

Windows 7 HP 64
 
 

1 byte = 8bits
Computer transfer bytes. So the transfer speeds you see is MB/s not Mb/s.
But the advertising is always bits/s.
So USB speed is bits/s. Same for internet speed.
To move 1GB of data (8G bits) with a USB 2.0 will take (theoretically) about 20 sec, not 2 sec.
My System SpecsSystem Spec
22 Oct 2017   #6
martinlest

Windows 7 Home Premium SP1 64-bit
 
 

Thanks Megahertz - I think I knew that at one stage, but had forgotten. If I move 1GB between my SSDs, it takes under 10 seconds; obviously HDD to HDD via USB will be a lot slower: I have to move/copy about 1.5TBs - about 2 days to do that I reckon!
My System SpecsSystem Spec
Reply

 USB3.0 transfer (low) speeds??




Thread Tools




Similar help and support threads
Thread Forum
USB3.0 transfer faster than internal SATA III?
Background: Just bought myself a new Welland USB3 2xslot hdd dock. It's connected to my 2-year old W7 PC via one of the computer's two USB3 ports (actually, the front one). My PC's main HDD is a 2-year old 2TB Sata3. It's about half full. (My CPU's an i5, 16GB ram) Oddity: I've just copied...
Hardware & Devices
USB3 write speeds... are these acceptable??
My HP folio 9470m gets about 30MB/s write speed to various USB3 flash drives. Read speeds are over 100. I ran a USB flash benchmark utility to verify this, although the write speed got worse as the file sizes got smaller (not sure if this is normal). I had a USB2 external enclosure with a...
Hardware & Devices
USB data transfer speeds
I am running Windows 7 Ultimate 64Bit with Service Pack 1. I have a P8Z77-V DELUXE M/B, i7-3770 CPU. All the USB drivers are the latest drivers and Windows itself is totally up to date. Yet, when I connect any USB device, I get extremely slow data transfers. I backed up some of my data to an...
Hardware & Devices
BitFenix USB3.0 Front Panel Giving USB2.0 Speeds
This one has been bugging me for a while and I was wondering if anybody could help me. I bought my rig (full spec to the left) a few weeks ago, it's an interim rig as my kids will be having it shortly when I upgrade to a full gaming rig, and I wanted to add USB3.0 ports to the front of the case so...
Hardware & Devices
USB3 install fail: feature transfer error: 2
I tried installing my NEC USB3 3.0 Host Controller File after a repair/upgrade install. Now, I get the above error during the driver setup. I downloaded the driver directly from Asus. Any ideas on the workaround? Thanks
Drivers


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 18:29.
Twitter Facebook Google+