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Jul 15, 2014 8:22 AM in response to Ernie Stamperby Ernie Stamper,After consulting a Genius at the Apple Store, where I was told the ports on the new Mac Pro should provide the needed power, proceeded to make other tests to see when and if it would be recognized.
I disconnected every USB device from the nMP, and then connected the Pioneer drive to various of the USB ports that should provide USB3. The device was now recognized on all of them. I then reconnected a powered USB3 drive I am using routinely, and then two other cables not active at the moment. Recognition of the Pioneer was not disturbed by this. I will have to experiment in time to see what if any activity can change this.
I find the document linked below confusing as to possible sequencing issues with USB connections:
Apple Computers and Displays: Powering peripherals through USB
Ernie
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by Grant Bennet-Alder,Jul 15, 2014 8:51 AM in response to Ernie Stamper
Grant Bennet-Alder
Jul 15, 2014 8:51 AM
in response to Ernie Stamper
Level 9 (61,185 points)
DesktopsThis paragraph (from the article you cited) causes Users the most trouble. The amount of power NOT supplied during sleep can cause high-powered devices to disconnect or stop working entirely. For best reliability of certain external devices (like rotating Disk Drives and full-sized DVD Readers) consider an external power adapter.
Your Apple computer or display must be powered on and must be awake. If your Apple computer or display is asleep, all ports will provide their normal maximum [i.e., 500mA] output. If your Apple computer or display is powered off, no power will be provided.
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Jul 15, 2014 9:25 AM in response to Grant Bennet-Alderby Ernie Stamper,Not sure how to apply that to my experience?
Ernie
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by Grant Bennet-Alder,Jul 15, 2014 9:38 AM in response to Ernie Stamper
Grant Bennet-Alder
Jul 15, 2014 9:38 AM
in response to Ernie Stamper
Level 9 (61,185 points)
DesktopsAre none of the onboard nMP USB ports capable of providing the needed power?
NOT if the Mac goes to sleep. Many Users have their Macs, especially notebook Macs, set to sleep on a very short idle time. Then the power supplied drops from a generous 1100mA to 500mA and external devices may not continue to function.