How serious are these errors?

Hello
Sometimes it happens that I get some errors when I check my HDD with Disk Utility:
Verifying volume “ Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
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
I know that I can fix such errors with Disk Utility run from my installation dvd.
What is the cause of these errors and how serious they are?
Best regards
Przemek

1.  After repairing with Disk Utility, re-run "Repair Disk" once more.
2.  If the error keeps reoccurring in spite of having been previously repaired, you should suspect some software you are using; backup/cloning apps are common 'culprits'.
As Kappy told you, most 'Volume Header' errors are not usually serious in themselves, but need dealing with so that they don't lead to something more serious.
 

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