Reuse a drive from a Drobo 5D

I upgraded one of the four drives in my Drobo 5D. I’d like to reuse the drive that I swapped out of the Drobo on my Windows Vista PC.

I put the drive in an external enclosure and connected it via USB. It’s a 3 TB disk but on the Windows Disk Management utility it shows 746,39 GB unallocated space instead, missing 3,25 TB.

The external enclosure is a Vantec NextStar Dual Bay Hard Drive Back model NST-D200 which is supposed to support up to two 4TB disks. The disk is a 3TB Seagate Barracuda ST3000DM001.

Any idea about how to bring the disk back to its original format to get access to the 3 TB?

The previous related thread i found was not helpful to me. If there is one, please point me towards it. I haven’t found any help ether through Google or anywhere else.

Thank you.

I bet the partition table is locked. Have you tried using the diskpart CLI to clean the table?