Can't access drive on network

I have noticed other threads that say I can restore the Disk settings for My Book World Edition(blue rings) admin password, IP address etc. to default without losing data - however if I did a Full Factory Default I would lose everything - something I really don’t want to do.

Can anyone advise on how I can do Defaults reset without losing the data ? Something about holding the RESET button down for a period of time. I have never carried out any software updates and the twin of my non accessible My Book World Edition(blue rings) functions fine but since it was the backup disk for my failing unit it is kept powered down.

I am also going to see if using a small fan blowing on the My Book World Edition(blue rings) that drops off the Network (not visible as a disk) improves the situation as other threads have suggested cooling problems. Oh God what a disaster. Let us all hope we can find some sort of solution.

Thanks everyone on this forum for all the suggestions. I will stayed tuned.

Surrinder