Prolem with usb 3.0 H81M-G

Hello everyone,

I use Win7 pro 64 bit, device HDD box WD elements 500gb support usb 3.0. i connect device (hdd box) with blue usb ports on motherboard :) thanks for support

trantuan1607 wrote: Hello everyone, I recently bought mainboard h81m-g and I discovered that usb 3.0 does not work properly with its speed . Specifically, the copy speed is 32 ~ 38Mb only / s . It is too slow compared to the standard usb 3.0. Where can I download usb driver for main h81m-g? On the homepage ASROCK have not found? How can i fix this? Please, help me. Thanks you. Sorry for my bad english :D

As Xaltar said, the Intel USB 3.0 driver is available on your board's download page:

http://www.asrock.com/mb/Intel/H81M-G/?cat=Download&os=Win764

You must have had a USB 3.0 driver installed for the USB 3.0 ports to work at all. Probably from an automatic Windows driver update. So the USB 3.0 driver from your board's download page may not make any difference in copy speed.

The copy speed that you will get over any interface, like USB 3.0 or SATA, is not one constant speed, it is variable depending upon many different factors. The maximum speed quoted for any storage interface is only achieved under certain circumstances.

The main factor causing different copy speeds is the size of the files being copied. Many small files up to about 50KB will be copied at much slower speeds than large files of 500KB and greater. That is caused by the extra processing by the Windows file system and the HDD to find, open, and start the file copy.

The USB interface does not use the SATA AHCI NCQ feature that reduces the amount of file system processing needed to do multiple file copies. USB will always be slower than any SATA drive.

Large files (many mega-bytes) appear to copy at faster speeds because there is enough time for Windows to actually measure the copy speed. Small 4K files will never be copied at say 50MB/s because the file copy is completed so quickly because it is so small.

What are you using to measure the file copy time, the display that Windows 7 shows during the file copy?

trantuan1607 wrote: Thanks Parsec and Xaltar. @Parsec:  you right, the display that Windows 7 shows during the file copy. I copied about 60GB file ( .iso file) and the speed displayed on the copy process is 30 ~ 35MB / s . I 'm downloading the driver you and xaltar gave me. Hopefully after drivers installed it will run properly with its speed

What are the source and destination drives being used? I know one is the WD elements 500GB USB 3.0 external drive, but what is the other drive?

You may just have a USB 2.0 driver installed on the USB 3.0 ports which accounts for the USB 2.0 range speeds.