WD My Book Duo controller failure

[fzabkar]

I don't know where the encryption key is. I'm not a DR pro.

[SOSdonnees]

I have a WD My Book Duo 2 x 2TB model WDBLWE0040JCH that seems to have a bad controller board.
Pretty sure the disks are ok.

I would suggest testing the disks, either directly connected in SATA to a tower, or trough an USB or eSATA dock, and use a software like Hard Disk Sentinel, HDTune, etc.

As for the RAID mode on the failed unit, it might be default (RAID 0) or RAID 1. I'm not sure.

Examine the content of the disks with an hexadecimal editor like HxD.
Similar content would be RAID 1 (= mirrored disks).

For My Book Duo (at least in RAID 1), even small sync error on one of the disks can make the storage unreachable.
Try only one disk in the enclosure and see if you can access the data.

My question is can I take an off-the-shelf My Book Duo (same model) and pop in the HDDs to recover ?
According to previous answer, first better try inserting only one disk in the enclosure.

So I have no idea if there is encryption, or if so, how it is implemented on this model.

I did not check for this specific model, but usually a char in the model name tells about it.