Drive constantly working

http://community.wd.com/t5/Network-Product-Ideas/The-options-to-disable-the-convert-wdmcserver-wdphotodbmerger/idi-p/712550

I found this in the threads, I think i will benefit you since the WDMCSERVER is what is causing your problem. I missed that earlier sorry.

4493     1 root     S    47616  9.3   0 92.8 {wdmcserver} /usr/local/wdmcserver