System hangs on boot

[rj]

When I boot my system it hangs at the following point (the system is
an HP Omnibook 5700CTX with RedHat 6.0 installed w/o additioinal
patches):

   Checking root file system 
   /dev/hda6 has reached maximal mount count, checked forced


This seems to be a hard problem because I have tried to boot sever
times with the same result.

Can anyone explain what this is all about and what I have to do 
to fix the problem.

Thanks!