help on installing fedora 9 on external disk

[Ravi]

  Hi ,
   
     I am planning to install fedora 9 on my external USB hard disk. right now my laptop is having windows vista. how do I manage vista when i unplug my USB hard disk because grub will be stored on external hard disk.
   
  I have a dvd with fedora 9 to install fedora 9
   
  I should be able to work on fedora 9 when I plug in  my external hard disk by providing options ( 1. fedora 9 2. windows vista )
  when I plug out and reboot my laptop, it should automatically boot windows vista without any problem.
   
  I am very much worried what if fedora 9 installation corrupts my windows vista MBR.
   
  I appreciate any suggestions regarding this.
   
  Thanks,
  Ravi

       
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