Dell Vostro 260 (Mid 2011) - Manual (Page 64)

System Message Description
CAUTION - Hard Drive SELF MONITORING
SYSTEM has reported that a parameter
has exceeded its normal operating range.
Dell recommends that you back up your
data regularly. A parameter out of range
may or may not indicate a potential hard
drive problem S.M.A.R.T error, possible hard disk drive
failure
64