Usb 2 / 3?

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

  1. disasterdrone macrumors 6502

    Joined:
    Aug 31, 2013
    #1
    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?
    Thanks!
     
  2. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #2
    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

    Joined:
    Mar 4, 2013
    #3
    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

    Joined:
    Aug 31, 2013
    #4
    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).
    Thanks!
     
  5. g4cube macrumors 6502a

    Joined:
    Apr 22, 2003
    #5
    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

    Joined:
    Aug 31, 2013
    #6
    Thank you - I misunderstood the OP - appreciate it!
     
  7. brdeveloper macrumors 68020

    brdeveloper

    Joined:
    Apr 21, 2010
    Location:
    Brasil
    #7
    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

    Joined:
    Aug 31, 2013
    #8
    My suspicion is that this is going to depend on the specific hub.
     
  9. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #9
    Apparently it depends on which device is detected first.
     
  10. old-wiz macrumors G3

    Joined:
    Mar 26, 2008
    Location:
    West Suburban Boston Ma
    #10
    A USB 3.0 device connected to a USB 2.0 port will only work at usb 2.0 speeds
     

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