disk bad sectors detected by F16 but not by F11

[Bruno Wolff III]

On Tue, Mar 20, 2012 at 09:01:45 +0300,
   Marek Piatek <marek.piatek at kaust.edu.sa> wrote:
>Users,
>
>I had no messages about bad sectors on F11. Recently right after 
>upgrade to F16 I got a message about bad sectors. Hence the following 
>question:
>Since F11 what changes have been made to F16 allowing better bad 
>sectors detection?

It's possible the sectors were already bad, but weren't noticed until
you did the upgrade (which would write over blocks that hadn't been touched
for a while). It's also possible that you weren't running smart checks
under F11, but started under F16.