I found different compatibility list, one support WD Red 6TB and the another one not on list.
I wonder that support or not, As I would to upgrade from 4TB to 6TB.
Please see to list of below link:
http://www.wdc.com/en/products/products.aspx?id=1180#Tab2&Tab9
http://www.wdc.com/ch/products/products.aspx?id=1180#Tab2&Tab9
Hamlet
April 13, 2015, 5:10pm
2
Hello,
The WD EX2 does support WD Red 6TB hard drives. You can verify this on the link below:
http://www.wdc.com/en/products/products.aspx?id=1180#Tab2&Tab9
LB_WD
April 14, 2015, 6:37pm
3
I would also make sure that you have the latest firmware on your My Cloud before upgrading the drives. Older firmwares didn’t have support for larger drives.