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Helpful answers
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Jan 6, 2013 1:43 PM in response to Forestronby Forestron,Just did a little more testing... Plugged in the HD's into the USB 2.0 port on my Thunderbolt Display... No noise.
So it appears that the problem is with the Mac Mini USB 3 Ports.
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Jan 6, 2013 2:03 PM in response to Forestronby Forestron,One last test... Plugged my Apple Superdrive in the Mac Mini USB 3 ports. Also pluged in a Wacom intuos 4 tablet in the USB 3 port of Mac Mini. Noise was lower than the HD plugged in... bouncing between 11% and 25%. That is with the HD's plugged into the Thunderbolt Display ports...
I put in a disc of pictures and video and played a video clip from a camera. the noise jumped up...
Just unplugged all usb devices from ports... noise still bouncing around... 7% to 31%.
There seems to be some correlation between USB ports and external devices plugged in, but there does not seem to be a consistent cause that I can put my finger on...
Oh, the modem I use for internet is the Motorola SURFboard SBG900 DOCSIS 2.0 Wireless Cable Modem. I use Shentel as my Cable ISP. The Modem/wireless router in in the basement and my computer is on the second floor of house. But my signal still comes in around the low 70% numbers...
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Jan 6, 2013 3:26 PM in response to Forestronby VikingOSX,You may find this article interesting, too.
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Jul 1, 2015 6:41 AM in response to VikingOSXby keithred,Your experience is interesting and mirrors mine with a 20141 Mac mini and a Freecom external USB 3 HD. After nine months of trial and error, two separate weeks away with a technician and countless conversations with helpful AppleCare supervisors, the problem is down to the HD. Without the HD the mini runs download speeds of 38+ through my fibre system, but as soon as the HD is plugged in, the speeds come racing down till I can't open an internet page and the downlooad speed is <10.
It was your article which gave me the initial clue to this and I am grateful to you for that. The questions now are: would the same problem exist with other USB 3 devices? how do I connect my HD up to a Thunderbolt port? I am unable to find a suitable cable for this purpose.
I am reduced to plugging in the HD each evening just to back up. That works, but it's tiresome.
Any ideas out there?
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Aug 18, 2016 1:29 AM in response to keithredby LinhNhat,I can confirm that other USB 3.0 devices are causing interference, at least with my Macbook Pro. I recently started using USB 3.0 devices including HDD docking station, ethernet device and USB hub (all 3.0 USB) and they all cause interference, raising noise level to 30%-40% making my WIFI miserable. Especially if I use the right side USB on my Mac (I only have two, one on each side). I am researching on how to shield the cables since I am moving all my devices away from the laptop so the only this left is the cable.