Is one of my drives dead?

You can use the WD Drive Manager app to verify the drives integrity.

Looks like in this case you have RAID 0 and that will use one drive for data and the other one for redundancy. If that’s the case the RAID seems to be working fine.

You can download the WD Drive Manager on the link bellow:

http://wdc.custhelp.com/app/answers/detail/a_id/3307

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