6TB harddrive shows two 2TB unallocated partitions

I am adding a new 6TB "WD Black" Western Digital drive. It shows two 2TB unallocated partitions.

I have re-initialized both the partitions to GPT. It should have done the trick but it did not in my case. Restarted my computer but still I can't get past the two 2TB allocated partitions. I want to claim all the 6TB space on the hard drive as well as use it as a single drive.

FWIW, I connected the drive connected via USB using a hard drive enclosure.

Solution 1:

I had connected the drive connected via USB using a hard drive enclosure. I talked to WD customer service and was recommended to connect the drive using SATA cable.

When connected via SATA cable, it showed a single disk with two partitions. I was able to expand one partition to claim the full 6TB. Good now. Thanks for your responses.