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I have tried resetting the SMC Controller and NVRAM without any difference. Nothing shows up in Disk Utility or Console. It is only after a period of time after boot up - not sure how long - the external hard drives no longer connect. 5.Īdditionally, everything works if I reboot the laptop and connect the external hard drives immediately after boot up. I know the cable and two adapters are in good working order because they worked prior to OS X 10.11.4 and. When connecting an external hard drive to the 12-inch, retina MacBook, I use one of the following types of adapters and/or cable: Apple’s USB-C to Digital AV Multiport or VGA Multiport adapters, or a Monoprice Palette Series 3.0 USB-C to USB Micro B cable. Apple’s OS X El Capitan 10.11.4 release notes reference updates to USB audio devices and Apple’s USB-C adapters. I suspect it has something to do with USB-C or OS X’s USB drivers. 5, not sure which, I have issues connecting external hard drives to an Early-2015, 12-inch, retina MacBook.