84 media write error (disk)

Hello,

We are getting 84 media write errors for a backup (nightly)  on a windows 2003 client. This backup is going to disk and its the only backup thats getting an 84 on the master server.  Need help solving issue, I have attached logs  below

Here is some info ..

windows 2003 32 bit

Netbackup client 7.6.0.3

Thanks in advance