How do I tell which drive has degraded? Mybook Duo


See attached screen, I have a WD mybook Duo and I am suddenly receiving this warning.

Do I need to replace one of the drives and rebuild, if so which one (i see no indication)?

Should i just hit “Rebuild” but will I lose my data?


Hi @coma77,

Please refer to the below link to check My Book Duo fails to rebuild its RAID 1 array due to a Read Error:


I have read through your link but it doesnt provide the answer to my questions as BOTH drives are still displaying “Online” status however I have a “degraded” message and the duobook external light is now orange. There is nothing to tell me which drive is degraded. What do I do next?


I appreciate that you have performed the troubleshooting steps.

Please contact the WD Technical Support team for best assistance and troubleshooting: