What about the commands in the starman link:
Did you try those?
NOTE: The Windows 7 (or 8) Logical Disk Manager does not distinguish between disks partitioned as MBR or GPT; both disk types are simply listed as "Basic"! One quick way to determine if a disk is GPT partitioned is to use the List Disk command of the "DISKPART" tool under a Command Prompt (may require Administrator rights). Simply enter the commands shown in GREEN below. If any attached disk has been GPT partitioned, an asterisk (*) will appear under the "Gpt" column; as shown in YELLOW for Disk 0 below:
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