Try what Luka wrote. Steam will see which files already there.
You can try downloading a game you don't have yet (Carpe Diem, small free VN for example) and install it into the main Steam games folder on your E: drive.
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I boot from C drive and have Steam games here. But I also have Steam games on E drive, yet my Steam library of installed games only shows the ones on my main drive, drive C. How can I launch the games that are installed on my E drive (without booting from it) ?
Obviously I have very low computer knowledge... :P
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