How to rapair my smart startup error

[firaseto]

my hard disk 1TB "2.5" inch mk1059MSG send message on the startup bios windows smart startup error 301 and checkup by Hard Disk Sentinel give me.what protblem and can fixit "Failure Predicted - Attribute: 5 Reallocated Sectors Count, Count of sectors moved to the spare area. Indicate problem with the disk surface or the read/write heads."

 

[ss202sl]

How to fix it? Go buy a new disk before this one completely dies. Also you may want to create a backup NOW.