Any Problem Using Two External USB-Powered HDDs on rMBP?

Started Mar 29, 2013 | Discussions thread
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Re: Shouldn't be a problem
In reply to Najinsky, Apr 3, 2013

Thanks for the reply. There's lots of useful information in your comment and the links. I can't say I understand some of the other posts in this thread, but I did look at the system report as suggested. For my USB devices I found the following:

  • OWC USB 3.0 750 GB, 7200 rpm - 900 ma available, 0 ma required (even when backing up)
  • Toshiba USB 2.0 750 GB 5400 rpm - 500 ma available, 2 ma required (even when backing up)
The OWC HDD is a Seagate Momentus with rated power requirement of 700 ma @ 5V. So even with the requirements for the Mercury On-the-Go drive enclosure, the total should be less than 900 ma. I've begun always connecting the USB 3.0 drive first as suggested in the link to Apple. The Toshiba drive is a self contained HDD with no separate enclosure. So I don't know its power requirements. But with USB 2.0 it should be less
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Best Regards,

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