Do you by any chance have one disk that uses GPT and another disk that uses the traditional DOS partition table format? (A partition management tool would probably tell you, if you don't know offhand - e.g. 'sudo parted -l').
Do you by any chance have one disk that uses GPT and another disk that
uses the traditional DOS partition table format? (A partition management
tool would probably tell you, if you don't know offhand - e.g. 'sudo
parted -l').