When I tried to uprgrade to Mountain Lion, my computer told me my HD was damaged. I'm right now using my external as my main HD. How do I fix this??

Last ight I downloaded (and paid for) Mountain Lion thinking it was going to be a simple uprgade. Naive I know.
In the process of restarting my computer, I got a message saying I have an error on my HD. When I checked it in disk utility, it said my HD is damaged. It wouldn't let me start my computer on it. I had to use my time machine restore point but then it used my other partitioned side as the HD to restart my computer. What do I do to get my mac HD back??

Ok, boot to Partition B and use the Finder Go> Computer and open your Partition A and grab your files, make another duplicate backup of your files to a regular storage drive and disconnect.
When that's completed use Disk Utility to select Partition A and erase with the middle selection and wait it out, it's zeroing the partition and mapping off bad sectors. You might have to use the command r boot to use the Recovery Partition.
Hold Command r keys while booting to enter Recovery and install 10.7 or 10.8 whatever, onto Partition A.
This is assuming your problem is located in your Partition A, which I suspect as your booting fine into Partition B, thus your GUID partition table, Recovery and EFI partitions (hidden) seems to be ok.
However you also should make one of these, this will allow you to boot from the USB and really wipe the entire drive, instead of partition to partition wiping like your doing now, this is in case your problem is located in the hidden partitions I've mentioned.
http://osxdaily.com/2011/08/08/lion-recovery-disk-assistant-tool-makes-external- lion-boot-recovery-drives/

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