Thank you. Please keep in mind that Windows 7 does not have included the USB 3.0 driver. Therefore, it is not possible to perform the installation of the Operating System from an USB 3.0 device.
As the driver is built-in Windows 8, you just need to install the proper device on the USB port and complete the normal installation process.
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While Win7 doesn't have the USB 3.0 driver built-in, that doesn't mean you can't install Win7 from a USB flash drive.
Win7 installs just fine from the USB drive; I've done this many times myself. You just may not get the full 3.0 speed until you install the 3.0 driver later.
Hi, I found this step-by-step guide, of how to prepare a USB 3.0 key to be used to install Windows 7.
Apparently it enables the higher speed of USB 3.0 during the process.
Language is german, but I think the images show pretty good how it is supposed to work.