Remove GPT Partition
Click "Start," type "cmd" in the "Search" box and right-click "cmd."
Run as administrator."
Type "diskpart" and press "Enter."
Type "list disk" and press "Enter."
Type "select disk x," replacing "x" with the number of your GPT
protected partition. Press "Enter."
Type "clean" and press "Enter" to clean the volume.
Toshiba Specific Instructions
To switch UEFI native mode to legacy BIOS mode (and disable secure
Restart the computer.
In Windows 8, from the Start or Desktop screen move your pointer over
the upper or lower right corner of the screen. When the Windows Charms
appear, click the Settings ( ) charm, click Power, and then the Restart
Press and hold the F2 key when the screen goes black, and wait for the BIOS
setup utility to launch. If your system cannot boot into Windows 8,
shut down the computer completely, then press F2 while powering
Select Security -> Secure Boot, and then Disabled.
Select Advanced -> System Configuration, and then Boot Mode.
Change UEFI Boot to CSM Boot.
To save the change and exit the BIOS setup, press F10.
Read more : http://www.ehow.com/how_7187926_format-gpt-protective-partition.html
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