2012 Macbook Air USB 3.0 Speed Test

Discussion in 'MacBook Air' started by vcuares, Jun 18, 2012.

  1. vcuares macrumors member

    Joined:
    Oct 30, 2008
    #1
    I did some tests. I have this 4bay enclosure for my Mac Pro.

    Same drive tested on Black Magic.
    eSATA on my Mac Pro = 98MB/s read 93MB/s write
    USB 3.0 on my Air = 39MB/s read 36MB/s write
    USB 2.0 on my Mac Pro = 28MB/s read 26MB/s write

    Is it my box? What results are you getting?
     
  2. oneMadRssn macrumors 68040

    oneMadRssn

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    #2
    What kind of drive is it? Maybe the drive is causing a bottleneck...?
     
  3. dasx macrumors 65816

    dasx

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    #3
    This is what I'm getting with an Sveon STG060 box and a SSD drive that I got from my broken 2010 MBP.
    (thread)

    [​IMG]
     
  4. vcuares thread starter macrumors member

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    Oct 30, 2008
    #4
    2TB Seagate. I tested the same drive via eSata and I get 98MB/s. The enclosure does both eSata and USB 3.0

    Drive type doesn't matter if tested in this manner, don't you think so?

    ----------

    Given the right drive, I'm happy it goes 172MB/s and not just 39MB/s.

    Unfortunately, we are similar, in a way that we are not maxing out our drives performance through USB 3.0. What gives, is it like this on PCs?

    What is the real word world max speed (not theoritical max) of USB 3.0.
     
  5. theSeb macrumors 604

    theSeb

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    #5
    There is something not quite right there. USB 3 should be just as fast as eSATA with mechanical HDDs. Frankly, even the eSATA numbers look low. What drives are you using in this box? Do you have more information than 2TB Seagate? Like model number and rpm? If the drive is a 5400 RPM model, that would explain the poor eSATA scores.
     
  6. oneMadRssn macrumors 68040

    oneMadRssn

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    #6
    I don't know USB3 well, but I do know the type of connection does matter. Anecdotally, I know that identical drives in identical enclosures will perform differently with USB2 and FW400, even though both have similar maximum speeds. Also, it depends on the USB controller in the enclosure.
     
  7. vcuares, Jun 18, 2012
    Last edited: Jun 18, 2012

    vcuares thread starter macrumors member

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    Oct 30, 2008
    #7
    Results are for one 1 drive (2TB seagate). It's 5400. Numbers for eSATA is just about right in my opinion. I'm OK with that speed. Like you, I'm expecting the same result for eSATA and USB 3.0 but got way lower USB 3.0 numbers.
     
  8. dasx macrumors 65816

    dasx

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    #8
    I'm very happy with those results. If you look at the thread I linked this external HD performs almost at a 50% speed of the internal SATAIII SSD, so I can't really complain.

    USB3.0 does a theoretical 5Gbps, which means 640MB/s. There gotta be some different bottlenecks. The drives themselves do limit speeds a lot. I don't think any SSD out there can do 640MB/s.

    But your case is pretty strange. Any external USB3.0 drive (a built one I mean) would do more than even a FW800 one I think. There's gotta be something wrong with your box or the drive itself. Maybe the cable?
     
  9. vcuares thread starter macrumors member

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    Oct 30, 2008
    #9
    USB 3.0 is rated way more than what my 2TB drives can manage. It should be able to max out my 2TB drive's 98MB/s easily but didn't.

    I'm trying to single out my USB 3.0 enclosure controller. By asking others their results, I'm trying to deduce if it is also a Mac specific problem too.

    ----------

    Would you happen to know your external SSD drive manufacturer speed specs? And are you maxing it out or at least near those numbers?
     
  10. theSeb macrumors 604

    theSeb

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    #10
    Ok, that makes sense for a 5400 RPM drive. The USB 3 numbers do not make sense though. Do you have another computer with USB 3 or another USB 3 enclosure perhaps? Looking at USB 3 external drive benchmarks, it's obvious that not all USB 3 controllers are created equal and there are variances, but those numbers are really low. Either the controller in your enclosure is rubbish or there is something not quite right with your computer. I am betting on the former, but I would try to test both to make sure.
     
  11. hashholly macrumors 6502

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    Oct 13, 2008
    #11
    Those numbers look painfully low, hopefully its just a usb3 controller issue.
     
  12. dasx macrumors 65816

    dasx

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    #12
    I ran Blackmagic on a Mini with a 5400rpm drive and gives me a ****** result of 62MB/s in both write and read. Maybe your problem resides in an old/malfunctioning drive which can't run at full speed.


    Went to their website and they don't even have it listed there. They got a previous 2.0 model but they don't specify anything either.
     
  13. theSeb macrumors 604

    theSeb

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    #13
    Since he gets what I would expect from a 3.5" 5400 RPM drive using eSATA, we can rule that possibility out.
     
  14. dasx macrumors 65816

    dasx

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    #14
    True that.
     

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