usb 3.0 problem :s

Discussion in 'MacBook Pro' started by jeharg, Jan 8, 2013.

  1. jeharg macrumors newbie

    Joined:
    Dec 30, 2012
    #1
    Hi friend!!
    Today I bought a mbp!
    I got a wd external 3.0 usb Drive but transfer rate is like usb 2.0, the cable is the correct and I havnt pkug any other device yet
    What could it be??
    Thanks a lot!!!!
     
  2. SDAVE macrumors 68040

    SDAVE

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    Nowhere
    #2
    Go to System Preferences, hardware > USB...find your WD drive, what speed is it running at?

    P.S. you didn't mention what MBP you have. Only MBP's after 2012 have USB 3.0.
     
  3. jeharg thread starter macrumors newbie

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    Dec 30, 2012
    #3
    i got a macbook pro 2012 :D
    in my System preferences it says, til 5gb/s :S
     
  4. SDAVE macrumors 68040

    SDAVE

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    #4
    Then your drive is slow.

    Use Black Magic Speed Test app from the App store and post a screenshot here.
     
  5. jeharg thread starter macrumors newbie

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    Dec 30, 2012
    #5
    but my wd my passport says it¡'s 3.0 :S
    how could it be?
    That speed test marks 78 read and 79 write mb/s
     
  6. thedarkhorse macrumors 6502a

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    Sep 13, 2007
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    Canada
    #6
    just because it has usb 3.0 doesn't mean you will get max 3.0 speeds, it is still limited by the hard drive inside it. seems about right for a 5400rpm 2.5" drive
     
  7. jeharg thread starter macrumors newbie

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    Dec 30, 2012
  8. jeharg thread starter macrumors newbie

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    Dec 30, 2012
    #8
    yes, but it says it has 5gb/s in the usb details in hardware, on my mbpro :S
     
  9. duervo macrumors 68020

    duervo

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    Feb 5, 2011
    #9

    USB 3.0 is just the interface between the enclosure holding the drive and the USB 3.0 port in your MBP.

    The drive itself is most likely a 5400RPM drive, which will be the bottleneck. While it will be faster than USB 2.0 speeds, it won't be fast enough to completely fill a USB 3.0 pipe.
     
  10. thedarkhorse macrumors 6502a

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    Canada
    #10
    that's because it is just telling you that 5gb/s is the max limit of usb3.0, your computer is capable of that transfer speed, but your hard drive is not. No single hard drive or SSD will transfer at 5gb/s, you'd need a bunch of fast drives/ssds in RAID 0 just to get near 1gb/s
     
  11. jeharg thread starter macrumors newbie

    Joined:
    Dec 30, 2012
    #11
    I've been fu++ed up by Western digital people?
    :S:S 1 tera with that data transfer rate is like nothing :S
     
  12. throAU, Jan 8, 2013
    Last edited: Jan 8, 2013

    throAU macrumors 603

    throAU

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    Location:
    Perth, Western Australia
    #12
    That is USB3's interface speed. You won't get that speed out of a spinning hard drive.

    The absolute max speed you're likely to get out of a SATA spinning disk (like, say my 3.5" western digital black) is roughly 100 megabytes/sec or so.


    Also MB/sec (bytes) vs Mb/sec (bits).

    If you were running USB 2, that is 480 megaBITS per second link speed, in reality nearer 320 megabit throughput. If your drive was running at USB2 speed you would be getting less than 40 megabytes per second. To convert bits/sec to bytes/sec divice by 10.

    Yes, there are 8 bits to a byte but there's a bit of signalling overhead and divide by 10 is roughly accurate once that is taken into account and easy to calculate in your head.

    You're getting nearly double that.
     
  13. SDAVE macrumors 68040

    SDAVE

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    #13
    That seems fine for a mechanical drive.

    If you get an external USB 3.0 enclosure like and pop in an SSD you will definitely get 300MB/sec+ for read and write.

    USB 3.0 breaks USB 2.0 limits and FW800 limits. It doesn't mean that your drive is fast enough for the interface to be maxed out.

    ----------

    No, your HDD is being maxed out by the interface, not the other way around.

    If you get something like this, then you will definitely push your USB3.0 port to it's max. They even have a thunderbolt version.
     
  14. Stetrain macrumors 68040

    Joined:
    Feb 6, 2009
    #14
    The connection between the hard drive and your computer is the full USB 3.0 5GB/s. The problem is that the hard drive itself is not capable of putting out those kinds of speeds.

    Putting a fast solid state drive in the same enclosure should result in much faster transfer speeds.
     
  15. boto macrumors 6502

    boto

    Joined:
    Jun 4, 2012
    #15
    75 mb/s Read/Write? Your external hard drive is within spec. That is the range of values you should receive with USB 3.0 + a 5400RPM hard drive.
     

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