Using Bootcamp to install a Windows partition on my iMac. I've created a partition on the HD. The format Bootcamp defaulted to is "Mac Extended OS (Journaled)." But when I try to install Windows on that partition from a USB external drive I created for this task (i.e., it has Windows installed on it), the error message I get is that the program can't be installed unless the partition is in NTFS format. How do I reformat just that partition to NTFS. . .or is that not possible? Thanks.