There were a red dot on S.M.A.R.T. dashboard. When I place cursor on it, it told me "Device has a few bad sectors.".
So I manually checked the S.M.A.R.T. information of the divice.
The Reallocated_Sector_Ct attribute seems normal:
Then I use openSeaChest tool by Seagate:
The No.5 attribute:
Please tell me what is going on the disk drive. Should I replace it?