Hey, sorry , one more question. I just check my PTV2 postsql driectory in my local hardisk, find that occupying 12.5 Gb, Does it mean that i need 12.5Gb as well when i move from ptv2 to pt3 ,by clicking the conversion button ? Thanks, if so , then i must use my D: , because my C: does not have 12.5 ...