USB 3.0- enough power..?

Discussion in 'MacBook Pro' started by John Fridinger, Aug 10, 2012.

  1. John Fridinger macrumors newbie

    Jul 25, 2012
    In a 2012 cMBP that is on its way I'm going to be replacing the 750/7200 HD with a Samsung 830, and putting the HD into a USB 3.0 Sata 3 external enclosure for back up... Does USB 3.0 provide enough power to the HD, or is an enclosure with additional power necessary..? And if so, such as..?

    And a connected question, if hooked to a USB 2.0 connection on another machine, enough power there...?

    Many thanks for all the great info in these threads...
  2. geoffreak macrumors 68020


    Feb 8, 2008
    A 2.5" drive can usually be powered over the bus (especially on Macs). I don't see very many externally powered 2.5" enclosures anyways.
  3. terraphantm macrumors 68040

    Jun 27, 2009
    USB 3.0 should be able to provide enough juice to pretty much all 2.5" drives since it can supply a decent bit ore current than USB 2.0.

    The enclosure should work in a USB2.0 port, but you *may* need one of those 2-ended USB cables to get extra juice from a second port.
  4. John Fridinger thread starter macrumors newbie

    Jul 25, 2012
  5. Orlandoech macrumors 68040


    Jun 2, 2011
    Salt Lake City, UT
    Just ordered one myself lol.

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