What does this message? hard disk: SMART status BAD . backup and replace . press F1 to resume?

What does this message? hard disk: SMART status BAD . backup and replace . press F1 to resume? ... Hard drive problem "Sec Slave Hard Disk: S.M.A.R.T Status Bad, Backup and Replace"? My computer has a message saying Hard Disk S.M.A.R.T ...

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