How safe is it to convert an MBR disk to GBT?

Just FYI, it might also touch a few sectors at the very end of the disk if they are not listed as being used in the existing partition table (I wonder if that could corrupt an mdadm device with metadata at the end of the drive?). The sectors written at the end of the disk are a backup copy of what is written at the start of the disk. This backup data will also need to be moved if you increase the size of the underlying device.

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