PureDisk STU Full - Not reclaiming the space.

Hi Everyone,

I need some help to fix my netbackup media server STU not reclaiming space. 

Netbackup Setup:

OS: Microsoft Windows 2008 R2

Netbackup Version : 7.1.0.4

Netbackup Master : 1 

Netbackup Media Server (Tape / Puredisk) : 6 

We are having problem with 1 of our puredisk media server.

Based on Disk Pool Status, Storage Pool is 99.89% Full.

However upon checking the Disk Reports > Images on Disk. Selecting concerned Storage STU to list all images, it shows no result or any images stored in it.

Hope anyone can help me to fix our issue. We need the Storage Unit to be avaiable again for backup.

Thanks.