SMART 5: Reallocated_Sector_Count
1-4 keep an eye on it, more than 4 replace
SMART 187: Reported_Uncorrect
1 or more replace
SMART 188: Command_Timeout
1-13 keep an eye on it, more than 13 replace
SMART 197: Current_Pending_Sector_Count
1 or more replace
SMART 198: Offline_Uncorrectable
1 or more replace