Is it possible to install windows 7 on mac on a external HD?

I would like to install windows 7 on my macbook pro but i can not afford the space on my internal HD, can i install windows 7 with bootcamp but have everything windows on my 500GB external drive, i also own parrallels desktop if bootcamp is not possible. Thanks for any help i can get.

Star1 wrote:
Hi Michael,
this is being discussed here from time to time:
(Now some pooping on Windows world):
Windows can't be installed on any external HD {as a matter of fact winOS can't be even started from a CD &/or DVD - any win install disk has to create an invisible install partition on your HD & run windows from there...} and has to be installed on partition C:\.
This, combined with 'briliant' "Registry" invention puts ANY windows OS (calling on you, Hatter) "behind the apes"...And how about outdated 'MBR' formating...
And your Parallels set-up will create a folder in your 'Documents' with the size of your win set-up (mine is 20GBs) so you aren't gainning anything.
That's incorrect, Parallels can use an external drive for its windows image, however it runs so slowly that way you might just want to scream!

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