Big problems with USB devices

Since I upgraded to El Capitan I have several, serious problems with USB devices:

1 USB hard drive: everything by watching a video from an external hard drive, the hard drive will be to disassemble all the minutes, the video will be of course hang and it takes 45-60 seconds until the drive reconnects. I also can not boot from any external hard drive more. Booting from a USB key works fine.

2. I can't transfer my Sunny BT11 of beam data more. The Sunny Beam is a device that records the data of my photovoltaic plant. The overview of the system he sees when connected via USB, however he is not recognized and so I can't transfer data files. Also, it makes not a difference if it is connected via a USB hub or directly, the two versions do NOT work. In the Finder preferences, all devices are controlled to display on the desktop.

The two scenarios always perfectly work with my Mac mini that has not been updated and uses Mac OS X 10.10.


Hello Gulliver,

It seems that if you live with loss of connection of your USB devices since the installation of Mac OS X 10.11 El Capitan, is that correct?

I suggest that you are troubleshooting by following the steps in this article - OS X El Capitan: If a USB device does not work

Thank you for using communities of Apple Support.


Tags: Mac OS & System Software

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