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I installed a WD Scorpio Black 320G last summer in my Toshiba Satellite laptop, running Vista. No problems with the drive or performance, but when I run Piriform Defraggler it reports anywhere from 38% to 40% defragmentation. Defragmenting won't bring it any lower. Tonight I downloaded Ausologics defragmenter and it only recorded 1% fragmentation after analyzing disc. How can the reports be so different? Which one do I believe?

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