I have an external HD with a mix of Mac, NTFS and Linux partitions. I wanted to use it to backup some partitions from my MacBook HD, and partially succeeded, copying a 100MB partition into an empty 300MB partition. Unfortunately Disk Utility won't let me resize partitions, or create any new partitions, giving the following message.
You can't resize partitions on this disk because it uses the Master Boot Record partition scheme.
Is there any way around this? None of my Windows partition programs can do anything with the Mac OS Extended partition. Can I convert to GUID Partition Table and still use with Windows XP?
I don't want to lose the content of the NTFS partition, which contains years worth of backups.
PS Is this a new issue with Mountain Lion? I thought I had done these on Snow Leopard.