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Här kan du läsa mer, gammal artikel (gäller gamla diskar)
http://www.silentpcreview.com/article786-page2.html
Där kan man läsa följande.
Silent PC Review sa:The reality is revealed by a sentence that Western Digital added to the description of IntelliPower: "For each GreenPower™ drive model, WD may use a different, invariable RPM." In other words, Western Digital reserves the right to release both 5,400 RPM and 7,200 RPM drives under the Green Power name — without telling you which are which.
We were able to confirm that our 750 GB Green Power had a spindle speed of 5,400 RPM by analyzing its sound spectrum.
samt
Silent PC Review sa:It's possible that other Green Power models use a higher spindle speed — but we doubt it.
och
Silent PC Review sa:It's possible Western Digital intends to release a 7,200 RPM version at some point in the future.
Det här stämmer med vad jag har läst tidigare om WD Caviar Green, nämligen att de inte har variabel rotationshastighet.