My Book World Edition II(blue rings)

WD Legacy Products Other Network Drives
1

I have two My Book World Edition II(blue rings) networ drives - 1 TB and 2 TB, configured as 0.5 TB RAID and 1 TB  RAID. I use them as backup drives - to archive my pictures (my hobby si photography), my software projects and etc. Byt de drives are almost full. Can I change the HDD drives in the device and wich typ shall be HDD drives be? For te two my devices?

Thanks end Regards

Nedyalko