Please remove inactive volumes in order to use the disk. RN104 #26317164

Hi there,

I came across this issue as I have the same problem.  For me, I have a RN104 NAS with 4 bays and bays 1,2 & 3 all have a WD RED 4TB HDD in each.  All working fine and happy days. Yesterday I received my fourth WD RED 4TB HDD that I ordered.

I powered down the NAS and inserted the drive and then powered back up.

The NAS booted ok and continued recogising the fourth HDD and was I presume re-configuring the system to accpet the drive and increase the capacity as expected and intended.

Yesterday after some time I saw the number 3 on the top of the NAS flashing and at the bottom I saw the following message: 

"Volume: Volume data health changed from Redundant to Degraded."

Then within or less than 1 min later : "Disk: Disk in channel 3 (Internal) changed state from ONLINE to FAILED."

Upon looking at the Admin Page which I was able to access the following day (today) I see that at the top the message:

"Remove inactive volumes in order to use the disk. Disk #3."

Now why would this disk have problems especially when it is the most recent disk prior to the new one yesterday to be installed.!!

This disk was installed approx. Jul/Aug 2015 - so its not that old.

Why would installing another drive effect it in this way ?

How do I resolve it without losing data ?

Its a strange technological world we are living in for sure !

Any ideas guys please would be grateful.