Booting to Windows - what I'd like to do

ok, first thing did when moved dell pc 27in imac install win 7 under boot camp (i have many pc programs toss them out).

anyway, partitioned 1tb drive of being mac os (lion) , 20% being bootcamp partition. can boot win 7 holding down option key , selecting win 7 (bootcamp) drive. works great. but, following:

1: move current boot camp disk image external drive can boot win, bootcamp partition on external drive. (i able have mirror image of current bootcamp partition , alow imac recognize , able boot it.

2. once can boot win on external drive, want delete bootcamp partition on imac 100% of internal drive mac os.

3. finally, if possible install virtual program (like parallells or other) allow me run win 7 on external drive virtual os (while mac lion running) using external bootcamp partition source of win os. have option of either booting directly win before, or running alongside win os , being hot switch between two.

so, want possible, , if process be?

in advance.

 

this guide can't help: http://guides.macrumors.com/boot_camp_windows_xp_on_external_drive

anyway, not seem possible run windows 7 external hdd.

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