Dynamic disks are not supported on USB.
http://support.microsoft.com/kb/254105
Dynamic Disk Hardware Limitations
John
yawnmoth wrote:
> In Computer Management -> Storage -> Disk Management, I right click on
> Disk 2, select "Convert to Dynamic Disk..." from the resultant menu
> and get the following error:
>
> The operation is not supported by the object.
>
> Any ideas? The disk I'm trying to convert is a 60GB 2.5" HDD
> connected to the computer via USB2.
>
> Also, how do I create mirrors in Windows Vista? In Windows 7, you
> right click on the partition and select "Add Mirror..." from the
> resultant menu. On Windows 7, that option is grayed out (I assume
> because I don't have any dynamic disks available) - maybe Windows
> Vista hides these particular menu options instead of graying them out?