I had the same issue and with some help solved this issue. After physically replacing the existing drives with larger capacity drives ( my case two 4TB replacing the 2TB) on a new unit so data loss is not an issue with me. After you repower the unit and wait a while you will get both drive status lights RED. You now need to log into your dashboard(in my case my previous PW worked with the login name “admin”; else you leave it-PW blank) and select storage icon at the top. you then scroll down to RAID and configure the newly installed drives in a RAID 1 configuration. Then you should see/be able to select via check box: switch to Raid 1>NEXT. Self test of the new drives will automatically start. You will get a few selections like: auto rebuild and by default uses all space on the array. It will then show the following info(my case) Volume 1 Raid 1 EXT4 3996GB Drive 1,2
NEXT REFORMAT HDD’S - DRIVES ARE PARTITIONED, FORMATTED
Formatting in my case took about 15 minutes and then gave the status info as:
Volume1 EXT4 Raid 1 drive 1,2 3.93 TB. Some of my exact steps and wording may be a bit off but with less than this info I was able to follow the prompts and achieve success. Ignore the error messages that show up during formatting ( not accessible, power loss, etc as they are irrelevant during the formatting process).
The drives will be completely configured just like a new product from the WD store. public folders etc
