Hello guys! I've recently acquired a 2009 Mac Pro and have been making some upgrades to the machine. My current setup is: PCIe SSD with El Capitan SATA SSD with Windows 10 1TB internal SATA spinning drive USB 3.0 card Two optical media drives - Superdrive, and a Blu-ray drive I've been having a problem that when I hold down option when I hear the chime, I'm presented with a grey screen for 15-20 seconds. Then the list of bootable drives shows up. When I boot straight into the OS X PCIe drive, it works fine. It's only when I hold down option to go into Windows that I experience a hindrance. Could it be the optical drives causing an issue? Is it okay to remove the optical tray, disconnect them and leave them out?