Windows 8 and Windows 10 Enterprise actually have a feature called Windows To Go. This feature allows you to boot a portable version of Windows, which I believe is different from WinPE, using certified devices like USB flash and portable HDD. Few have Enterprise Edition Windows and you're doing this with Windows 7 - therefore it is irrelevant, but I thought I'd point it out.I see a lot of info on creating a bootable USB installation disk .
What I am interested in , is a bootable USB of actual Win 7 .
In case of hard disk boot troubles , I could use this to get in at least .
Seem to recall , years ago seeing such a thing .