USB 3.0 and 2015 MBP

Discussion in 'MacBook Pro' started by redneck6497, Mar 27, 2015.

  1. redneck6497 macrumors member

    Joined:
    Jul 6, 2009
    #1
    Can anyone test an external USB 3.0 HD to their 2015 MBP using the Blackmagic speed test app? I seem to be mostly striking out in that dept. I can't get anything that has any decent speed. I bought a new PNY 3.0 thumb drive. I get around 120 MB/sec read, but maybe 50 or so write. My WD My Passport drive sometimes goes down to 13 writing, and maybe up to a max of 50.

    I don't think its the MBP though b/c my MBA has similar results.
     
  2. yjchua95 macrumors 604

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    Apr 23, 2011
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    GVA, KUL, MEL (current), ZQN
    #2
    It's normal. The HDD and the USB stick are too slow to saturate the bus.

    On my Transcend 960GB JetDrive USB3 SSD, I get around 400MB/s in both reads and writes.
     
  3. redheeler, Mar 27, 2015
    Last edited: Mar 27, 2015

    redheeler macrumors 603

    redheeler

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    Oct 17, 2014
    #3
    As mentioned above, you can't expect the bus to be saturated by a cheap and tiny USB 3 thumb drive. I recall briefly using one as a boot drive, honestly slower than an HDD.

    Edit: Same goes for the USB 3 HDD. It's likely only a 5400 RPM also.
     
  4. ZBoater macrumors G3

    ZBoater

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    Sunny Florida
    #4
    103.7 write, 107.9 read. A Seagate slim USB 3.0 external USB3 drive.
     
  5. redneck6497 thread starter macrumors member

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    Jul 6, 2009
    #5
    I don't think its saturating it for sure, but I'm just wondering if the USB hardware in the mac is working ok. It seems really slow, but I think part of it is the drive itself.

    Also, I saw a joke the other day. The Lacie rugged drive with thunderbolt .... why? its a 5400 RPM drive.
     
  6. redneck6497 thread starter macrumors member

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    Jul 6, 2009
    #6
    I bought a PNY SSD and put it in an OWC case. I mostly got about 250 on read and write ... it did mysteriously go go down to like 110 several times ... not sure why.

    I also bought one of the backup Plus units mentioned here also. I got around 110 or 120 out of it.

    I think maybe there is something wrong with that WD passport 3.0 drive I have ... no reason for it to go down to like 13.

    Does anyone have a super 2.5 USB 3.0 slim enclosure they like for SSDs? I don't know the one I have is so great.
     
  7. yjchua95 macrumors 604

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    GVA, KUL, MEL (current), ZQN
    #7
    I use an Archgon UASP 2.5" enclosure with USB 3 and get around 430MB/s in both reads and writes, with a 500GB Samsung 850 Evo in it.
     
  8. redneck6497 thread starter macrumors member

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    Jul 6, 2009
    #8
  9. yjchua95 macrumors 604

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    GVA, KUL, MEL (current), ZQN
    #9
  10. redneck6497 thread starter macrumors member

    Joined:
    Jul 6, 2009
    #10
    So after getting the enclosure, there was a modest increase in writes, but a dramatic increase in reads. Now its 424 read and 276 write. Not shabby for an 85.00 SSD.
     
  11. Anand953 macrumors regular

    Joined:
    Mar 28, 2015
    #11
    I too use a USB 3.0 slim seagate HDD. I am happy with the speed i get as I use it majorly for media storage...
     

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