I have a My Book Duo in RAID 0 and I would like to know if it is damaged one of the two disks can send warranty only damaged or have to send two with the external case
According to page # 72 of the User’s manual you can replace one of the internal drives if it fails. all you need to do is contact WD Support with the following information:
The serial number of your My Book Duo device
Date of purchase
The serial number of each internal hard drive you need to replace
Take a look at page # 72 of the User’s manual for more information.