Saturday, February 7, 2009

Can you convert an MBR disk to GPT?


Can you convert an MBR disk to GPT?

I got a question today: Can you convert an existing MBR disk to GPT?

This is about the partitioning style of a disk, with MBR being the older one (limited to 2TB) and GPT being the newer one (going up to 18EB). Keep in mind that the GPT partitioning style is not recognized by all previous versions of Windows.

The answer to the question is yes, you can convert an MBR disk to GPT, but only if your disk is unpartitioned. If there are no partitions on the disk, the option to "Convert to GPT disk" will be available in disk management.

Convert to GPT

You also have that choice, obviously, when you are partioning an unintialized disk, as shown in the picture below:


You can see this information and a lot more at
You should also look at

Jose Barreto's Blog : Can you convert an MBR disk to GPT?


alex said...

That is not useful at all: what is the point in requiring the disk to be empty ?????
The whole point of a tool like this would be to have a partition in place with data and one needs to convert to GPT without losing the data.
Come on, MS can do much better than that, but we find over and over that they simply chose not to...

alex said...

BTW, yes, I understand that it needs space in the begining of the disk to reserve allocation for those extra dozen partitions that GPT supports, so a gparted-like to move/shrink the existing partition is also welcome.

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