Rosie Harding and Peter Fernandes, Goa, India
Turn On Always Verbose Booting for OS X
Simply execute the following nvram command at the Terminal to enable verbose boot mode and set it to ‘always’ (meaning every system boot is verbose by default):
sudo nvram boot-args="-v"
Disabling Verbose Booting on the Mac
Equally simple is the ability to disable verbose booting, which will basically make OS X boot as normal – this is the default boot behavior of every Mac:
sudo nvram boot-args=
Check current nvram firmware boot settings
If you’re curious what the current firmware nvram settings are, type the following:
“Windows cannot be installed on to this disk. The selected disk is of the GPT partition style”
Reverting Your Hybrid GPT/MBR Disk Back To a GPT Disk For Windows 8/8.1 Boot Camp Installation
Boot into OS X
Download GPT fdisk utility (gdisk) from Sourceforge and install it : Navigate to the .pkg app file in Finder, “press control key + mouse click” or “right mouse click” to install.
Launch Disk Utility (/Applications/Utilities/Disk Utility.app)
In the left pane select the Hard Drive (not Volume) which contains the OS X and BOOTCAMP partitions that BCA has created for you and click on the Disk Utility Info button (CMD+I)
In the Info window, note down the Disk Identifier value of your hard drive, e.g. in the example below the Disk Identifier is “disk0”
Launch Terminal (/Applications/Utilities/Terminal.app)
Launch gdisk in terminal by copying and pasting the following text into Terminal without the quotes, “sudo gdisk /dev/disk0”, enter your system admin password when prompted
Type “p” to view the partition table to confirm it is the correct hard drive you want to work on, if not type “q” to quit gdisk without making any changes and try again with another disk
Assuming you have the correct disk (i.e. entered the correct Disk Identifier to launch gdisk), type “x” to enter the experts menu
Type “n” to create a fresh protective MBR; note upon completion gdisk will not confirm a change or display any indication anything has been done, it will just show you another experts menu prompt
Type “w” to save the changes you have made, confirm this action when prompted to do so
Shutdown your Mac and unplug ALL other hard drives other than the hard drive you intend to install Windows 8/8.1 on. Also unplug all SSD cards or USB drives attached to your Mac
Reboot your Mac whilst holding down the Option key and Boot into the “EFI Boot” disk to continue Windows 8/8.1 installation
Solution #2: Via the Command Line in Terminal
You can completely disable the chime, there is a command line you can enter while in Terminal that will silence the chime until you turn it back on again.
Just open up the Terminal application, you can find it in “Applications” -> “Terminal,” and enter the following on the command line:
sudo nvram SystemAudioVolume=%80
You’ll need to enter the Administrator password when you enter this command.
If you decide you’d like to reenable the system chime, simply enter the following on the command line:
sudo nvram -d SystemAudioVolume
Again, you’ll need to enter the Administrator password to execute this command.