NBU 7.5 has a drive control down problem

Dear all,

My system is windows 2008 R2. NBU is 7.5. Library is SuperLoader 3.

In the beginning, the drive control is normal, however, after processing backup about 5 minutes, the drive control down has been happened.

I tried to reboot the server and library but not workable. The server and library which I purchased within one month.

Do you know why? I heard there is a bug between NBU 7.5 and SuperLoader 3??

Please advise, thanks.

Howard.