Hello everyone.
I used Crystal Disk Info and Hd Tune, all things in the HD are marked OK,but the Spin Retry Count shows this:

Current 208 Worst 199 Threshold 223 and marked in red.
I never felt slowdown or strange sounds, or freezes. I have it since 2002,it survived a wet place -the big fish tank broke and all living room with the pc was flooded-, electric problems -the power supply burned after a electrostatic issue-, and many times the energy was out. I scanned with Norton Systemworks and all is OK.

I read some parameters in S.M.A.R.T. determinates the live of your disk,but I don't know if Spin Retry Count can count.Anyway, all the other things are marked OK.