Error when Verifying Disk.  Any hope of not having to format?

Installed updates the other day, and my Macbook Air would not boot after this. It just sat there with the Apple logo and the circling clock deal below it.
I had a Snow Leopard DVD which I hadn't gotten around to installing yet. Booted off of it and ran the Disk Utility. It found the following:
"Incorrect block count for file http/%2F%2Fwww.apple.com%2Fstartpage%2F.webhistory (It should be 2 instead of 0 )" and "Invalid sibling link"
I then selected "Repair", but it reported that the disk could not be repaired
Incidentally, I also selected the option to install Snow Leopard at this point, but it did not list my hard drive under "Select target drive" or whatever the installer says.
Many are suggesting I just format the disk and install Snow Leopard to see how that goes. But I worry whether the drive is physically failing, and whether that would be a waste of my time and I should just replace the drive under my warranty. Is there any different utility I could use or any other hope of getting out of formatting and starting all over? I do have backups of my data, but it's just one of those things. I want to exhaust all my options. Thanks in advance.

I had this issue once before on my MacBook. The only other way to fix the issue is to invest in DiskWarrior and see if that will help.
I'd go ahead & erase the drive, restore your data, and see if the problem comes back. If so, get the drive replaced.
You also want to check your backup drive & make sure it has no issues as well.
~Lyssa

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