WD My Cloud 6TB 1 Bay mit neuer Festplatte betreiben Translattion: operate WD My Cloud 6TB 1 Bay with new HDD

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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Sorry; my German isn’t very good, but using it and Google translate, I can understand you.

And I can understand why it is hard for you to understand the complex threads.

Here is another thread that is clearer. I haven’t had to replace the hard disk, but @Bennor has, and with a 1TB drive. He wrote this guide: