Green dot on unassigned device when other drives are preclearing?

[ScoopGP]

Hi guys, 

 

Noob here, but could anyone tell me what the green dot means in this context?  I'm preclearing my drives before setting up an array.  The two 1tb drives have already been precleared.  I started the preclear process on the 3 4tb drives, and one of the 1tb drives lights up green.  What do the indicators mean in this context.  I don't think there's necessarily a problem, but I don't understand what it's telling me here.  

 

Thanks!  

 

[trurl]

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