I bought a 480 gigabyte PNY Solid State Drive yesterday and wanted to install OS X El Capitan on it, but I ran into an issue. I put the Solid State Drive in the hard drive bay and I connected my hard drive externally via a SATA to USB adapter. When I turned on my MacBook, it didn't boot from the hard drive despite the fact that it was directly connected and it was powered by an old PC's PSU. I turned my MacBook off and then restarted it and held the Option key after I heard the chime. But instead of being able to choose the boot drive, my MacBook only showed the option of Internet restoration. Why is this? Is this an issue with El Capitan? How do I fix this? I upgraded the stock hard drive to a SSHD back in 2012, so I'm familiar with booting from an external drive and also choosing a boot drive at boot, but that was in OS X Mountain Lion and the procedure may have changed in El Capitan. Has the drive preparation procedure changed in OS X El Capitan?