The size of the GUID partition table (GPT) disk is not updated on a Windows Vista-based computer after you use a disk management program to expand a logical unit number (LUN)
Consider the following scenario:
- You are running a Windows Vista-based computer.
- To provide additional space on the computer’s hard disk, you run a disk management program to expand the size of a logical unit number (LUN).
In this scenario, the LUN size is not updated after you run the disk management program. This issue occurs if you use a computer that includes GUID partition table (GPT) disks.
Note: A master boot record (MBR) disk does not experience this issue.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB950927.