install windows 7 on external hard drive

Finally boot from Ubuntu 10.04, and choose to install it to the external drive and the bootloader to the external drive ( here, again, I believe just before the install starts, you'll have to select advanced mode and select to install the bootloader to the external drive).Choose to write grub onto the external drive. Boot from Linux Mint and install it on the external drive.Windows 7 bootloader will be written to the internal drive, and should give the option to boot Windows XP & Windows 7. Windows 7 will detect the Windows XP installation and will ask if you wish to upgrade, select no, goto clean install mode and let it install on the internal drive.Point it to install onto the external drive.I chose to install Win 7 bootloader on the internal drive, and the Ubuntu one on the external drive. Recently I did a install of Win 7 on my laptop hard disk and Ubuntu + openSUSE on the External one, without disconnecting and what not. I don't see why you should disconnect the internal hard drives, probably just a precautionary measure. What kind of partition it should be so that I could install and boot different OS on an external hard drive? this tutorial. So that I could physically disconnect the internal drives? But can I still use those OS' in the laptop if I do that? Can the os installed on external hard drives be used on the laptop if I do install it through the use of a desktop. Or can I just install the 3 os using my desktop. Isn't there other ways beside physically disconnecting internal hard drives? I've done some research before coming here and found this one I would like to install the first 3 os' on the external hd. Windows 7(Main OS, which will be installed on the laptop's hard drive).But I want to be able to boot multiple OS on it. I have only 200Gb of hard disk space on my laptop.

Install windows 7 on external hard drive