Skeptically fast speeds on 6TB WD drive during preclear


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So I recently purchased a 6TB Blue drive to expand my array. I understand from reading certain topics in the past that the preclear step isn't required anymore, but I like to do it anyway (old habits die hard). 

While preclearing my disk (WD60EZAZ) the UI reported that the drive was doing the pre-read at +393MB/s. AFAIK it is impossible for spinning disks to read data that fast. Not that I'm complaining per se I just want to make sure nothing is wrong with the disk.

I was running the preclear add on from within the webUI for the disk above as well as a shucked one at the same time (WD80EMAZ). The other disk showed common speeds (100-200MB/s for r/w)

 

Has anyone else seen this type of behavior before? Thanks in advance for any clarification anyone light offer.

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