Medium size problem

Hi,

Iam new to DP and need your help eventhrough the problem might be silly.

We have DP 6.2 running on window server 2008 using ultrium LTO4.

For a backup the session shows that its finished successfully, no errors present. But the size of backup is 2TB and it has used only one medium with max size 1.6 TB.

When you go to the medium the object are written but the available size of medium it is not change (it shows free space 100%)

Any advice,

Thnx