I have an external Toshiba USB 3.0 HD and my 2012 MBP 13 will not recognize it. My PC laptop has a SATA input that will recognize it up but the USB ports on PC will not. My 2007 iMac recognized it and so does my PS3. I have been doing some reading and it seems like there is not enough power coming from the USB ports on my 2012 MBP to run it. Any ideas on how to fix this? Will ML fix it. Is there a different 3.0 external HD that takes less power and that will work. Please help me. Thanks.