[SOLVED] Do I need to format old drive when installing new SSD?

Dec 1, 2019
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I have a quick question for you guys. So I'm planning on getting a new SSD to upgrade my PC, I want to install new Windows on it also. My question is do I need to format my old HDD. I don't really want to because I have a lot of downloaded games on it and I have slow internet so Installing them again would take forever.
 
Solution
For Steam games:

After you've installed the OS on the new drive, and the new Steam client, tell the new client where those games are on the other HDD.

Steam games location
In the steam client:
Steam
Settings
Downloads
Steam Library Folders
Add library folder
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