Ok thanks - no sign of a warning though. It just said I'll need to reboot afterwards.
I read that KB article, and it says this:
Quote:
Use the Diskpart Command RETAIN to Create MBR Partition Information
If you have access to a Windows XP graphical user interface (GUI) that is already on the system, you may be able to use the Diskpart retain command to create the MBR partition table information.
The retain command prepares a dynamic simple volume to be used as a boot or system volume by writing the flag that states that the partition is retained in the dynamic disk database and then putting an entry in the MBR partition table for that partition.
On an x86-based computer, the retain command creates an MBR partition entry on the dynamic simple volume with focus. To create an MBR partition, the dynamic simple volume must start at a cylinder aligned offset and be an integral number of cylinders in size.
Does this mean that if I install another XP system onto the D drive (which is blank), I can then create a MBR (using the retain command) for the C drive and boot back into the original system?