I select "Migrate from a Physical to a Virtual Machine". Source disk is 37.2 Gb NTFS Destination disk is 232.8 FAT32 (173 Gb free space) Select MS Virtual PC option & "pre-allocate all disk space" Select "Adjust OS to virtual hardware" Copying starts and then after about 10 minutes this message appears: "Insufficient disk space. Not enough free space to expand virtual disk. PLease free some space on the volume where virtual disk container resides to continue the current operation." I'm copying a 40Gb drive to 173Gb of free space. Why am I getting this message?