Watch the video:
Timestamps:
0:00 - Explanation
0:44 - Adding a new Steam Library
1:25 - Moving game to another disk
2:00 - Move complete
Got yourself a new hard disk or SSD? Want to move Steam games around to save some space? Well, it’s not super easy if it’s your first extra disk you want to use with Steam, but this video should help explain exactly what to do to get on your feet :)
Move files over the network (1Gbps+!): Go to post or View on YouTube
Timestamps