Scratch what I said about install being able to install externally; it doesn't work either. I have to install the OS on my HDD then clone over to my SSD.
Hello, I have a Macbook pro 2012 and am currently trying to diagnose whether my sata cable could be faulty or could it be the SSD firmware. I have a Samsung 850 Evo and a Sandisk Z400s and for some reason I can't format, partition, erase, or install the OS on either internally, which always results in an error. However, I am able to format them externally using a sata-to-usb adapter and is able to boot internally once the OS is installed externally. Btw the original Toshiba HDD that came with the laptop does not encounter these issues. Does anyone have any ideas what could be the problem? Thank you.