Mbp... Not all USB ports are created equal

Discussion in 'MacBook Pro' started by mac8867, Nov 6, 2010.

  1. mac8867 macrumors 6502

    Apr 5, 2010
    Saint Augustine, FL
    II discovered a very interesting anomaly with my mid-2009 13". I plugged my ipad in to syncs and charge, and the ipad said, "not charging." some research on the net yielded information that the iPad requires a higher powered USB port, which all late model macbooks have... All except mine apparently.....

    So, I tried the other USB port, and low and behold, the ipad started charging. So the question is, is this the design of the MBP, or do I perhaps have a sub-optimal USB port?
  2. Hellhammer Moderator


    Staff Member

    Dec 10, 2008
  3. grahamnp macrumors 6502a

    Jun 4, 2008
    It's not sub optimal, the iPad requires a 10v USB port and the newer macs are equipped with one of those.
  4. Daku93 macrumors regular

    Oct 29, 2010
    Do you mean 10W? Beacause there are NO 10V USB Ports. They are all 5V. If they were 10V every device that's not an iPad would break if you connected it.
  5. zapro macrumors newbie

    Nov 21, 2010
    Wow 10 watts from an USB socket would mean hot plugs and burned connectors in the long run.

    The USB connector is rated for 2,5 Watts maximum (500 mA) - pushing 2 Amps would be asking for trouble :)

    // Per.

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