Verify Disk in Disk Utility freezes the system

[___]

Dave,

fortunately after verifying the hd
with Disk Utility I left the mac running
for a while and got

Verifying volume “Mac HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Incorrect number of thread records
Checking multi-linked files.
Checking multi-linked files.
ng Catalog hierarchy.",0)
Checking Extended Attributes file.
Checking volume bitmap.
Volume Bit Map needs minor repair
Checking volume information.
Checking volume information.
E,"Invalid volume free block count",0)
(It should be 5723644 instead of 5723642)
The volume Mac HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair

after repairing the internal hd and the clone
everything went fine (I missed repairing...)

Cheers...