Attribute Name: Uncorrectable Sector Count
Attribute ID: 198
Attribute meaning: Quantity of uncorrectable errors. The raw value of this attribute indicates the total number of uncorrectable errors when reading/writing a sector. A rise in the value of this attribute indicates that there are evident defects of the disk surface and/or there are problems in the hard disk drive mechanical subsystem.

Critical: Yes

Attribute Name: Current Pending Sector Count
Attribute ID: 197
Description: Current count of unstable sectors (waiting for remapping). The raw value of this attribute indicates the total number of sectors waiting for remapping. Later, when some of these sectors are read successfully, the value is decreased. If errors still occur when reading some sector, the hard drive will try to restore the data, transfer it to the reserved disk area (spare area) and mark this sector as remapped. If this attribute value remains at zero, it indicates that the quality of the corresponding surface area is low.

Critical: Yes

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