The E5470 was the last generation of hardware that had support for Windows 7, and it doesn't have full support with any out of the box Windows 7 distribution (Microsoft never updated any of the released Windows 7 installers with full USB 3.0 support, for one). Taking an OS installed in a foreign system and trying to boot it in the Dell even installed internally is going to require challenging tinkering. That's before you add in the complication of booting from a USB 3 hardware set that isn't going to be set up correctly on the moved Windows install disc.
You can sometimes get Windows to boot from an external installation, but it's going to require reinstalling to the external drive when that's connected to the E5470 to have any hope of working. You just will not get the existing install to boot from an external USB drive.
ejn63
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November 4th, 2022 09:00
There are a number of issues you will face:
The E5470 was the last generation of hardware that had support for Windows 7, and it doesn't have full support with any out of the box Windows 7 distribution (Microsoft never updated any of the released Windows 7 installers with full USB 3.0 support, for one). Taking an OS installed in a foreign system and trying to boot it in the Dell even installed internally is going to require challenging tinkering. That's before you add in the complication of booting from a USB 3 hardware set that isn't going to be set up correctly on the moved Windows install disc.
You can sometimes get Windows to boot from an external installation, but it's going to require reinstalling to the external drive when that's connected to the E5470 to have any hope of working. You just will not get the existing install to boot from an external USB drive.