Can I dual boot windows 7 and mountain lion with an external hard drive.

I have Mac OSX mountain lion installed and running on my 2TB external hard drive. Boot camp says that I have to use the default flash storage that came with my computer.. Is there a way to put it on my external hard drive if I partition it? I also am having a problem when I tried to use the default storage the setup would not let me format it to NTFS

By default, Boot Camp formats the drive with FAT32. That's because Windows XP could be installed with FAT32 so, in order to write on that partition on Mac OS X, Boot Camp used it instead of NTFS.
If you want to install Windows 7 (it's the only version that your Mac supports), you will have to format the Boot Camp partition in NTFS manually. To do it, just start the Windows installation as usual but, on partitioning screen, choose "BOOTCAMP" volume, press "Drive options" and then, Format, so the partition will be formatted in NTFS and you will be able to install Windows

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