troubleshooting Question

Data Lifeguard Diagnostics - Interpreting and Acting on the Test Results

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hypercubeFlag for United States of America asked on
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I've been using Data Lifeguard Diagnostics in the form of GWSCAN from Gateway - as this version seems to deal with SATA drives.
My approach has been:
1) Run the SMART test.  If this fails then there IS a problem.  It usually doesn't fail.
2) Run the QUICK test.  If this fails then IS THERE A PROBLEM?  I've always assumed so.

If the QUICK test fails then there is a message displayed:
"Please back up your data and then run extended test OR run a full media scan to resolve this issue ...."

This implies that the result of the Quick test may be fixable.  Indeed, I've done it and the Quick test issue was resolved.
But, where does that leave one?  What does "resolve this issue" really mean?

My approach has been:
If the QUICK test fails then replace the hard drive.
But, if the 3rd step resolves the issue then am I doing someone a disservice by having them buy a new hard drive?
That's why I need to know more about what "resolve this issue" really means.
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