(Solved) - How to install Windows 8 in a separate disk(12 posts)
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I imagine it would be the same as this tutorial, only using a Windows 8 ISO instead of a Windows 7 ISO.
Regardless of the way you actually install Windows 8, make sure that your Windows 7 hard drive (or SSD) is UNPLUGGED when you go to install Windows 8. That way there is no possible way for you to overwrite your Windows 7 installation.
See what other posters have to say as I have not installed Windows 8 yet.
Hopefully this is helpful.
Simple - disconnect the Windows 7 disk (power or Sata cable) and install Win8 on the new disk. Reconnect the Win7 disk when the installation is done. Then you switch from one to the other with the BIOS boot priority.
Another option is this. You can use the new disk in lieu of an external disk for that.
Good point by all.
I use a Windows PE/RE Boot USB to prepare the HD Geometry FIRST before loading Windows 8 in Custom Install mode.
That lets me do diskpart commands to make a (1) Full formatted Partition of the HD so forces windows 8 to make MBR installation.