steam
I uninstalled and re-installed steam. I didn't uninstall my games, and they still exist on my hard drive (I checked).
I have an SSD and a HDD, and to save space I install programs (including steam) to C:\Program Files (x86)\Steam drive (SSD) and games to D:\Games\SteamApps (HDD). How to I let steam know the programs are installed there?
Not to bump an old thread unnecessarily, but I just finished building the tool I think you're looking for:
Your profile has to be public and it's not perfect, but should give you a pretty close idea of what kind of hard drive space you'll need to install your entire collection (or on multiple drives, per Steam's new feature to specify install location).
Cheers!
[Edit] Just realized a screencap might be nice:
Steam has probably made a library folder on the drive that you installed the Steam client on. If you don't have any games on that drive and don't intend to ever install any on it, go to Steam>Settings>Downloads>Steam Library Folders, select the library folder of the drive you don't want to install any games whatsoever to, and click "Remove".
Furthermore, you can use the same method (except you click "Add" and not "Remove") to add another Steam library folder.
Best Answer
There is now an official support article at support.steampowered.com covering some other solutions as well.
Go to Steam > Settings > Downloads tab > Steam library folders. Add the
D:\Gamesfolder there and restart Steam. Steam should then be able to find the installed games again.