camcontrol error

[Axel.Gruner at suedfactoring.de]

Hi,

i have a problem with camcontrol (running FreeBSD 5.4-STABLE).
Checking the defects on my drive will print out an error which i do not
know:

#camcontrol defects da0 -G -f bfi
camcontrol: Error returned from read defect data command

#camcontrol defects da0 -f phys -G
camcontrol: Error returned from read defect data command

So, what could be the problem?

 Thanks in advance.