Start with a full backup of everything on that drive.   Then run a full diagnostic (F12 at powerup) on the drive.  The reallocated sector count means you are seeing bad sectors that so far, the drive has been able to reallocated to spare ones.  That may not last long -- until enough develop that the drive needs to be replaced.  
Dear All,  My HDD setup is 256GB SSD +1TB Hybrid Drive but from yesterday the Hybrid Drive is not being shown. Please advise how to get it fixed, I have checked the Disk Management under Device Management. Started in Safe Mode, uninstalled all latest installed updates, etc.  Firmware was updated two days ago, I am not sure if that is the cause but I think that can not be reverted. The m15 R1 warranty has expired. Thank you [IMAGE]
m15 R1, Hybrid Storage Drive not visible