Windows 8 and 8.1 Forums


USB3 Fast -- Fact or fiction

  1. #1


    Hafnarfjörður IS
    Posts : 4,376
    Linux Centos 7, W8.1, W7, W2K3 Server W10

    USB3 Fast -- Fact or fiction


    Hi there.

    I read a load of posts here but I can't get ANYTHING like the USB3 speeds I've been reading about on these Forums.

    USB3 WD passport USB 3 2TB drive plugged into USB3 port on laptop -- lucky if I can get 35 mb/s transfer. Not using a Hub either.

    Old fashioned USB2 drive (2.5 old laptop drive but 7200 RPM device -- Hitachi Model) connected via USB 2 Port to SAME laptop 63 mb /sec -- same data files to Internal SSD directory. Model is 7k320-320GB drive 7200 rpm. Nearly 2X FASTER data transfer than the USB 3 drive !!!!

    Running W8.1 X-64. - Real physical machine -- not a VM.

    What gives here ?? ( I notice the Hitachi drive seems also to have a much larger cache too) but finding laptop drives that run at 7200 rpm is a bit like looking for Hens Teeth. The USB3 passport drive seems a HUGE disappointment as regard to speed - although it's good for portability and capacity.

    Cheers
    jimbo

      My System SpecsSystem Spec

  2. #2


    Quote Originally Posted by jimbo45 View Post
    Old fashioned USB2 drive (2.5 old laptop drive but 7200 RPM device -- Hitachi Model) connected via USB 2 Port to SAME laptop 63 mb /sec -- same data files to Internal SSD directory. Model is 7k320-320GB drive 7200 rpm. Nearly 2X FASTER data transfer than the USB 3 drive !!!!
    This doesn't make any sense to me. USB 2.0 max speed is 480Megabits/sec. Due to bus access constraints, the max speed one typically can get from USB 2.0 is about 35MB/sec. I've never once seen a USB 2.0 device over 40MB/sec.

    I tested at work with


    In the USB 3.0 Anker dock, My results were

    • Intel 320 Series SSD. Average 166MB/sec, Min of 158MB/sec, Max of 170.9MB/sec with 0.2ms access time
    • Seagate Momentus 500GB. Average 89.0MB/sec, Min of 57.0MB/sec, Max of 110MB/sec with 15.5ms access time.


    In the USB 2.0 Thermaltake dock, My results were
    • Intel 320 Series SSD. Average 38.3MB/sec, Min of 37.1MB/sec, Max of 38.7MB/sec with 0.3ms access time.
    • Seagate Momentus 500GB. Average 38.3MB/sec, Min of 36.6MB/sec, Max of 38.6MBs/ec, with 15.7ms access time.
      My System SpecsSystem Spec

  3. #3


    Covington, La
    Posts : 1,184
    Windows 7 HP 64bit, Windows 8.1 Pro w/Media Center 64BIT


    Use this little program to see what USB speed your device is using. It looks like it may be at High-Speed (USB 2) instead of Super-Speed (USB 3). Look at Connection Information and it shows what speed is selected.

    USB Device Tree Viewer

    Jim
      My System SpecsSystem Spec

  4. #4


    Posts : 376
    W8.1, W7


    An anecdote, using usb 2 external drives, copying a large file:

    Hitachi 2,5 1G 7200
    usb 2 port on pc = approx 25 MB/sec
    usb 3 port on pc = approx 40 MB/sec

    WD 3,5 1,5G 5200
    usb 2 port on pc = approx 25 MB/sec
    usb 3 port on pc = approx 35 MB/sec
      My System SpecsSystem Spec

  5. #5


    Posts : 1,720
    Windows 8.1 Pro


    Approximately 1.5GB mp4 file,

    USB 2: (approx. 115 sec.)

    Attachment 42679

    USB 3: (approx. 19 sec.)

    Attachment 42680
      My System SpecsSystem Spec

USB3 Fast -- Fact or fiction
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