The LED behavior indicates power and operational status of Samsung external drives.
S1 Mini, S2 Portable, S3 Portable:
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Standby Status: Steadily lit LED
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Read/Write in Progress: Blinking LED

STORY Station
Power is on when Power Dial is turned to the On position after connecting the power adapter.
The LED becomes brighter as the dial is further clockwise.

D3 Station:
-
Standby Status: Steadily lit LED
-
Read/Write in Progress: Blinking LED
