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Apple Computing Products:
macOS - Notebook Hardware
USB Power
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<blockquote data-quote="kevindryer39" data-source="post: 753527" data-attributes="member: 64653"><p>Unfortunately, the different port issue was intended in the design of the Macbook in order to lengthen battery life. Your PASCO tech happens to be correct in the fact that only one port is meant to be a high-powered port.</p><p></p><p>However, it confuses me that according to USB specifications, low-powered devices are supposed to pull a max of 100mA and high-powered devices are supposed to pull up to 500mA and your tech quoted a max of 28mA.</p><p></p><p>An easy way to check how much power is being allocated to your USB device(s) is to go open your System Profiler application (Applications -> Utilities). On the left column there should be a category for USB. From there you can see how much power that device is being allocated.</p><p></p><p>I know this isn't a definitive answer, but I hope it points you in the right direction <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>good luck!</p></blockquote><p></p>
[QUOTE="kevindryer39, post: 753527, member: 64653"] Unfortunately, the different port issue was intended in the design of the Macbook in order to lengthen battery life. Your PASCO tech happens to be correct in the fact that only one port is meant to be a high-powered port. However, it confuses me that according to USB specifications, low-powered devices are supposed to pull a max of 100mA and high-powered devices are supposed to pull up to 500mA and your tech quoted a max of 28mA. An easy way to check how much power is being allocated to your USB device(s) is to go open your System Profiler application (Applications -> Utilities). On the left column there should be a category for USB. From there you can see how much power that device is being allocated. I know this isn't a definitive answer, but I hope it points you in the right direction :) good luck! [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
USB Power
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