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My Cloud EX2 Ultra front panel lights

I just want to know if my Cloud EX2 is on sleep mode or working 24/7 . When my Cloud EX2 is sleeping then what do the disk1 and disk2 lights do ? Can you tell me the three lights in front of my EX2 do when it is on sleep mode . Thank you

My EX2 never sleeps (security camera recordings) but my single drive MyCloud light comes on and off slowly when it sleeps.

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