You can see in this posting how my drive had 8 pending sectors (shown by Drive Scope) and 8 unremapped bad blocks detected by TechTool Pro, and ultimately, the drive itself resolved the situation. Later, TechTool Pro and Drive Scope agreed about the current state of the drive. The 8 pending sectors were caused by an improper shutdown of my iMac. I do not think that will happen in your case:
How many bad sectors is reasonable before a drive should be replaced?
It would be interesting to see the results of the Surface Scan, if you have TechTool Pro.
For the benefit of others, here is the description of S.M.A.R.T. attribute 197 from the Drive Scope manual (page 33):
Attribute 197 - Current Pending Sectors Count
Lower Raw Value is better - Critical Attribute
This attribute is the current count of unstable blocks waiting to be remapped. If a sector marked for remapping is subsequently written or read successfully, this value is decreased and the sector is not remapped to the reserve sector table. Remapping will only occur on a failed write attempt and if a spare sector is available, while failed reads do not cause remapping. After remapping a sector, the raw value will be decreased and reallocated sector count will be increased. See SMART attribute 5 increases in reallocated sectors.
WARNING: If a failure is reported for this attribute, backup the data immediately and consider replacing the device as soon as possible.