how to convert mbr to gpt at boot time(windows 8.1)by sanjay kranthi tech
Booting to a Windows CD and getting to the Command Prompt
Place the Windows CD into the drive and turn the system off.
Press the power button and rapidly tap the F12 key.
When the One-Time Boot Menu appears, choose CD/DVD (optical) drive and press Enter
(Watch for the message "Press any key to boot from CD" and quickly press any key if it appears)
After the disk loads:
If you are using a Windows 8 CD, choose Troubleshoot Advanced Options Command Prompt
If you are using a Windows 7 CD, choose English and then click next. On the next screen, choose Repair your computer, from the lower left-hand side.
Once the command prompt is open, please follow the instructions below to complete the conversion process.
Converting a hard drive from MBR to GPT using a Command Prompt
At the command prompt, type diskpart and press Enter.
Type list disk and press Enter.
Type select disk # and press Enter.
(Substitute the # with the actual number eg. select disk 1)
Type clean and press Enter.
Type convert gpt and press Enter.
Type exit and press Enter
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