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#71
Windows 10 supports multiple partitions. See the article below:
How to set up multiple partitions on a USB flash drive on Windows 10 | Windows Central
The following is my example. I booted my PC from "Disk 3" and then clean-installed Windows 10 from "Windows ISO(J:)", the second partition.
Why do you bother about Windows 7 when you intend to install Windows 10?