I just got a pair of new 3TB disks that I wanted to put on my Windows 2003 server enterprise x64 system, SP2, all updates installed.
When I first tried to convert to dynamic, I got the error "The operation did not complete" as described in this KB article
http://support.microsoft.com/kb/826823
It says there is a patch, but there is not one for x64, just x86 and ia64
I found another technet discussion here: https://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/cb62238c-b3d0-4989-b45a-ae6de6701a7b?stoAI=10
However its best suggestion is to use a product from AOMIE, but I tried that and it didn't even recognize the disk. It also suggests that one needs a better version of diskpart.exe and to try to the 32 bit version. Anyone have any experience with that?
I also tried creating moving the disk to Windows 7 x64, making it dynamic there, but when I move the disk back to 2K3 it does not recognize it, and goes back to a 2TB partition. I also saw something about needing a 512 block size for 2K3, but W7 does not allow anything smaller than 1K.