1 Reply Latest reply: Nov 30, 2012 8:55 AM by Larry West
Lejaxhe Cédric Level 1 Level 1


When I connect a hard drive or even a key to my MacBook Pro, the peripheral is so slow !

For example, with my USB 3 hard drive on my USB 3 port, I need more than one hour (sometimes 2) to transfer a 100GO file. Do you have a solution?


Thank you very much,

The Belgian Man

MacBook Pro (13-inch, Mid 2012), OS X Mountain Lion (10.8.2)
  • Larry West Level 1 Level 1

    According to this Apple Document: http://support.apple.com/kb/HT5172#8


    "How do I get the best performance from the USB 3 ports?

    The first device you plug in will configure the port, so always connect USB 3 capable hubs or devices first.

    What happens if I plug in a USB 2 device into the USB 3 port first?
    If you plug in a USB 2 hub first, all devices connected or "daisy-chained" to that hub will operate up to the maximum transfer rate of USB 2 speed (480 Mbps)."


    I'm hunting around here to see if there is apossibility to reset this without restarting the Mac...