Use that ^^^^ . I just had same problem and this fixed it for me without issue. You will have to re-provision of course after making the change.
I can change the drive assignment by going into the ADAM database and change it but this is becoming a pain in my behind. Everytime I click on the edit tab of any of the pool from View Administartor and click ok even if i have not change any settings I have to go back and change the drive letter in ADAM for some odd reason it reverts back to *. and I would have to go in and change it to Q. This is pain for me becuase We have home driver which assign H as a driver letter. Is there any other way I can change the drive letter beside of going into ADAM database? I was reading the fourm and VM Ware stated that In View Manager 4.6 and later releases, the User Profile disk may be configured and changed through the GUI in the pool settings. Is this has been done or they are still working on it. If anyone knows any better way of doing this please assist me or point me in right direction. Thank you all.