> hi, for me that sounds as the disc said 'huh, i wasn't able to decipher 
> what was on my platter, so i read again, proved it and wrote +1 to the 
> counter'...? jeeeeez.

The errors are corrected in the read-buffer (cache) without any performance
loss. Yet this is only a fraction of the magic modern drives use
to acheive current data densities ...