Macbook Pro: Can't get USB 3.0 speeds

Discussion in 'MacBook Pro' started by JefferyShin, Jul 7, 2012.

  1. JefferyShin macrumors regular


    Jun 20, 2009
    I have a rMBP which comes with two USB 3.0 ports. I also have a 2TB My Book (USB 3.0), and a 3TB of the same My Book.

    Under system information, it has the max speeds at 5Gb/s, which is roughly 600MB/s, yet when I run tests (Blackmagic) and transfer files, I'm getting only around 100-120MB/s.

    Any solutions?
  2. simsaladimbamba

    Nov 28, 2010
    That is perfectly normal, as mechanical HDDs do not offer speeds faster than 120 to 140 MB/s, often even less than 120 MB/s. Just because you have a fast interface (USB 3.0) and a slow device (HDD), does not mean, that the slow device will work faster than it is supposed to do.
  3. JefferyShin thread starter macrumors regular


    Jun 20, 2009
    I see... so the only true USB 3.0 capable externals are SSDs?

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