http://www.ubuntu.com/download/help/...ick-on-windows

Best way would be to make a USB-bootable-Ubuntu installation. Or whatever you want to call it. Attach the secondary hard drive after making the USB stick bootable (Ubuntu). Put the USB in your new computer and boot into Ubuntu. Go to the file browser on Ubuntu and you should be able to move stuff over to the new computer. Then use another bootable program called gparted to format the old hard drive then you can use both for storage (old hard drive as a backup /fail safe).

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