The SMART reports bad sectors and some parameters are bad.
Seek Rate attributes, hardware ECC Recovered, Raw Read Error Rate and "attribute Unknown 187" are suspected
I run chkdsk X: /V /X /R /F and run Format X: (surface format with wnidows format).
Info of the disk:
S/N: Do we need to deliver it?
Model: ST3500320AS (Firmware: SD15)
Power On Time: 30:00:00Hs (hh/mm/ss)... Really little, and already has 15 bad sectors

Is my hard belongs to a lot?, Should I send it to the warranty?
**I am sorry if my English is not good, I speak Spanish.**