Retina MBP card reader slow?

Discussion in 'MacBook Pro' started by JayMBP, Aug 11, 2012.

  1. JayMBP macrumors regular

    Joined:
    Apr 25, 2011
    Location:
    Richmond, BC/Bellingham, WA
    #1
    So I just got my hand on my 2.7 rMBP.

    Everything is running smoothly and blazing fast.

    The only exception seems to be the built-in SD card reader.

    According to Anandtech's review, they had very good results on the reader. But when I tested mine with the Sandisk UHS-1 SD card (rated 45MB/s), the reader on MBP seems to max out around 20MB/s, while my Sandisk USB3.0 card reader has no problem getting almost to the limit.

    Anyone know what is wrong?

    Built-in
    [​IMG]

    Sandisk USB3.0
    [​IMG]
     
  2. BB.King macrumors regular

    Joined:
    Jun 29, 2012
    Location:
    London UK
    #2
    My 32GB SanDisk SD card works fine in the rmbp, I think it is the same as yours rated at 45MB/s read and write. I confirmed it with iStat menu 3 disk activity, the maximum speed was 48MB/s.

    Maybe try this app or one of the many Windows ones if you have Windows installed on your machine.
     
  3. JayMBP thread starter macrumors regular

    Joined:
    Apr 25, 2011
    Location:
    Richmond, BC/Bellingham, WA
    #3
    I tested again with AJA system test. And it shows almost identical result.

    Built-in reader topping at 20MB/s while USB3.0 at 42MB/s
     

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