Have a 2011 Mac mini, MacBook Pro, MacBook Air and iMac- If Software Update hasn’t yet told you about it, there’s an EFI Firmware Update available that you might want to install.
According to the release notes, “This update improves the reliability of booting from the network, addresses an issue that can prevent HDCP authentication after a reboot, and resolves an issue with boot device selection when a USB storage device is hot-plugged.”
The direct links to the updates are as follows:
Mac mini EFI Firmware Update 1.6 – Mac mini (Mid 2011) iMac EFI Firmware Updat…
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2011 Macs get EFI Firmware Update