Will this adapter when used with the new 12" Retina MacBook allow simultaneous Mac charging while also powering a USB portable drive ?

Since the new 12" Retina MacBook has just a USB-C port the issue arises on how an external HD can be attached. If say, one wants a self-powered USB HD access can this be plugged into the adapter with or without the USB-C power cable connected ? If the USB-C power cable is connected to the adapter will it both charge the Mac as well as providing power to the USB self powered HD ? Thanks.

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  • In my experience, it usually worked, but I also had a larger 4 TB Seagate drive (that actually contained two spinning drives) which would automatically eject. So, for standard one-drive externals, it's fine.

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