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Defraggler had a little tool that shows the health of the HDD.

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But I'm unsure what this all means. Could someone explain them, and which values are good and which are bad?

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While you see the numbers, means the HDD is good. Once you stop seeing them, means its dead :) – Rook Nov 25 '11 at 16:34
Might as well copy and paste the SMART wiki page. Just a suggestion. – surfasb Nov 25 '11 at 16:50
Is this SMART? Didn't know :) – Simon Verbeke Nov 25 '11 at 17:11
up vote 2 down vote accepted

I found a wiki here:

You will have to judge the values accordingly, relative to the HDD's specs.

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