Windows 8.1 has been setup in legacy boot mode,it means it is MBR. But I want to chane it to UEFI boot mode which means GPT partition. Can I change in bios legacy boot mode to UEFI boot mode? Will my partitions and data will be destroyed?
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You first have to convert your partitions to GPT. Its possible to do this without data loss but it is extremely technical and isn't for the unexperienced. – Ramhound Jun 15 '15 at 11:12
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UEFI uses GPT partitions. According to Microsoft, you cannot change the partition scheme on Windows without data loss.
"You can change a disk from MBR to GPT partition style as long as the disk does not contain any partitions or volumes."
However, if you're feeling risky, this website suggests a couple of ways to convert to GPT without data loss. The easiest of these involves using a tool called "AOMEI Partition Assistant Lite Edition." Using this software, you should be able to just right click on the disk and select "Convert to GPT/MBR disk."
Alpheus
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While I don't think you're spamming here, please be advised that AOMEI has a long pattern of spam posts here on Super User. – bwDraco Oct 22 '15 at 03:09