I need help with Steam?

-The Passing came out for Left 4 Dead 2 -I wanted to play L4D2 -I clicked L4D2 on steam -Pop up says Steam has found a problem with your local game file. Game files will now be re-acquired from the steam servers. -Someone told me I have to re-download the game to play it again -I right click L4D2 in steam and... show more -The Passing came out for Left 4 Dead 2
-I wanted to play L4D2
-I clicked L4D2 on steam
-Pop up says Steam has found a problem with your local game file. Game files will now be re-acquired from the steam servers.
-Someone told me I have to re-download the game to play it again
-I right click L4D2 in steam and click "Delete local content"
-I try to delete it but a pop up says "You do not have enough disc space available to run this game. Please fee up some disc space and then try again."

I have 2 hard drives on my computer. One that cant fit L4D2 and another that can. How can I get L4D2 to download on the hard drive that has enough room?
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