Disk is locked - mountain lion help!!

Hello, I tried to download Mountain Lion yesterday and it said my disk needed repair. But it doesn't give me the option to repair it. I verified the disk permissions,etc. When I try to download it again, it says my hard drive is locked. I hope it didn't crash!!! Help!!

VK said for locked HDs and volumes at http://discussions.apple.com/thread.jspa?threadID=2329689
sudo chflags 0 /Volumes/"name of locked HD"
sudo chmod a+rx /Volumes/"name of locked HD"
Assumes you can boot into recovery mode and select the Terminal app from the Utilities menu. If so, copy and paste the first one into the window that pops up, and hit the return key. When the Password: prompt pops up, carefully type in your admin password, since nothing shows on the screen, and hit the return key. Copy & paste the other one, hit the return key. You won't get the password prompt, since the initial one's good for five minutes. Quit the Terminal app and try restoring the OS.

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