I took apart my external 2TB HDD. The casing held two 1TB hard drives inside. I took the hard drives off because I wanted to use them internally, however I've put them back and decided not to. Now when in Windows it doesn't show up and under Disk Management it says Uninitialized.
Is this because I put the hard drives back in the enclosure in the wrong order? I don't know which hard drive was on top of which.
Maybe the external HDD has reinitialized the raid because I've had them in the wrong order?