I got this error message when verifying the disk

Question

The electricity in my apartment was abruptly shut down while I was using my imac. After I'd got all the electricity back on, I turn on my mac and found that when I verified the disk in disk utility I got this error message.
Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Illegal name
Illegal name
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Volume Header needs minor repair
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
The repair button is in grey so I couldn't do anything. So far, the computer seemed to work fine, but what is the necessary thing to do in this situation??
Can anyone help?? please.
Navin

Answer 1

I'd stay away from disk warrior etc. Try disk utility.
DiskWarrior is not a disk repair program in the conventional sense. Instead of patching the original directory, it uses a patent-pending technology to quickly build a new replacement directory using data recovered from the original directory, thereby recovering files and folders that you thought were lost and that no other program could recover.
I've never had trouble with Journaled HFS+ volumes but if I did I try disk utility to repair. Then run fsck from single-user-mode. Then, if that failed I'd pull my data off and erase.
I've never had any persistent luck with norton type utilities, the problems always come back until I erase.