# LED indicator lights on SDOCK2U313R

**URL:** <https://community.startech.com/t/led-indicator-lights-on-sdock2u313r/1875>\
**Category:** Cards, Drive Accessories, Tools\
**Created:** [January 25, 2026, 4:01pm UTC](https://community.startech.com/t/led-indicator-lights-on-sdock2u313r/1875 "2026-01-25T16:01:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![coptechs](https://avatars.discourse-cdn.com/v4/letter/c/df788c/32.png) [@coptechs](https://community.startech.com/u/coptechs)\
**Post date:** [January 25, 2026, 4:01pm UTC](https://community.startech.com/t/led-indicator-lights-on-sdock2u313r/1875/1 "2026-01-25T16:01:45Z")

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I am trying to duplicate a 4TB drive to another 4TB drive in standalone copy mode. When I insert both drives the indicators light up blue. I then press the START duplication button and both drive LED’s appear to flash blue _ **AND** _ red and the first progress LED flashes blue. Both the Power and PC/Copy buttons are solid blue and red respectively. I am not seeing any progress on the progress LED.

I have tried it with 2 different source drives and 2 different destination drives and as soon as I click START, the lights appear as indicated above. The source drives are from a Synology NAS that used a RAID configuration.

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**Author:** ![EmmanuelB](https://yyz2.discourse-cdn.com/flex012/user_avatar/community.startech.com/emmanuelb/32/24_2.png) [@EmmanuelB](https://community.startech.com/u/EmmanuelB)\
**Post date:** [January 26, 2026, 8:11pm UTC](https://community.startech.com/t/led-indicator-lights-on-sdock2u313r/1875/3 "2026-01-26T20:11:29Z")

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Hello @coptechs and thank you for your interest in our Community.

Based on what you’ve described, this appears to be a startup/confirmation issue rather than a drive problem.

1. **On power‑up, please confirm the dock is in COPY mode.**  
The PC/COPY LED must be red, not blue. If it’s blue, press and hold the PC/Copy button for ~3 seconds until it turns red before pressing START.

2. **Wait for the Drive LEDs for each drive to be illuminated blue before hitting START.**  
It may take up to 10 seconds for the LEDs to illuminate. When both drives are BLUE, then press the START duplication button to begin duplicating.

> If the destination drive is smaller than the source drive, the LED for the drive that you’re  
> duplicating data to will blink red to indicate an error.

Here is a table of the LED status:

 ![image](https://canada1.discourse-cdn.com/flex012/uploads/startester/original/1X/af098f132118bc564236bea844d97b865901a408.png)

Please let us know what the results are, we look forward to hearing back from you.

# 

Emmanuel  
[StarTech.com](http://StarTech.com) Support