Updating flash drive
Even though Windows recognizes and displays the USB hard drive in the installation screen, it doesn’t allow you install Windows on the same.
When you attempt to install Windows 7 on external drive, you get “Windows cannot be installed to this disk” error.
Chrome will remind you that the changes will not take effect until you restart your browser.
There can be wide variations in speed between drives (e.g.WARNING: As with all firmware updates, it is strongly recommended that you backup or make copies of all important files before performing this update.This firmware update process is done entirely at your own risk.So, if you want to install Windows 7 on an external hard drive you need to follow the steps given below.The procedure is simple but you need to install Windows Automated Installation Kit (WAIK) first to get some files.