Usb 2 / 3?

Discussion in 'MacBook Pro' started by disasterdrone, Jan 16, 2014.

  1. disasterdrone macrumors 6502

    Aug 31, 2013
    So I connected a drive to a USB 3 port. How do I tell what speed the drive is operating at without doing a test transfer and timing it? Is there any way to get a report of what speed of drive is connected to what port?
  2. Gav2k macrumors G3


    Jul 24, 2009
    Yeah in the system profile menus

    Should add... Goto..Apple Menu (top left of screen) > About This Mac, and then click More Info.
  3. saturnotaku macrumors 68000

    Mar 4, 2013
    Macs only come with either USB 2.0 (2011 and earlier) or 3.0 (2012 and later) ports, not both. So if you have a USB 3.0 device, it should work at full speed when connected to any port on your computer.
  4. disasterdrone thread starter macrumors 6502

    Aug 31, 2013
    Thanks - I know the port is USB 3, I want to know whether the drive connected to it is being recognized and used as a USB3 drive, or connecting as a USB2 drive (the port operates in legacy mode for compatibility).
  5. g4cube macrumors 6502a

    Apr 22, 2003
    As OP noted, look at the USB entry for System Profiler. Negotiated connection speed will be indicated.

    So, if a connected USB 3.0 device connects, and only negotiates a USB 2.0 connection, indicated connection speed will be 480Mbps.

    This can happen with faulty firmware, low-quality cables, wrong cables and/or a combination of those factors.
  6. disasterdrone thread starter macrumors 6502

    Aug 31, 2013
    Thank you - I misunderstood the OP - appreciate it!
  7. brdeveloper macrumors 68020


    Apr 21, 2010
    I'd like to know the following scenario: suppose I buy an USB3 hub and connect to it one USB3 device and one USB2 device. Is the port capable of providing USB3 speeds to the USB3 device?
  8. disasterdrone thread starter macrumors 6502

    Aug 31, 2013
    My suspicion is that this is going to depend on the specific hub.
  9. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Apparently it depends on which device is detected first.
  10. old-wiz macrumors G3

    Mar 26, 2008
    West Suburban Boston Ma
    A USB 3.0 device connected to a USB 2.0 port will only work at usb 2.0 speeds

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