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Asynchronous vibrations: The physical reason mixing 5400 and 7200 RPM drives ruins your NAS

Here's why you shouldn't mix different speed HDDs on your NAS ...
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What's The Meaning Of RPM And Why Does It Matter?

When discussing speed in relation to a car or truck, the conversation usually refers to miles per hour a vehicle can travel, as seen on a speedometer. However, aside from the vehicle, the engine too ...
ExtremeTech

Western Digital Caught Misrepresenting HDD RPM Speeds, Too

Earlier this year, Western Digital got caught lying by omission when it came to disclosing that certain drives used shingled magnetic recording (SMR) instead of conventional magnetic recording (CMR).
Ars Technica

Western Digital is trying to redefine the word “RPM”

Last week, the fine Redditors of /r/DataHoarder got upset with Western Digital again—this time, for misrepresenting the rotational speed of their WD Red Network Attached Storage hard drives. (Although ...