Compresson ratio for LTO2 400GB

[scherzinger urs]

im using: server2003sp2, HP 1/8 448 Tape Autoloader on Firmware:1.5/S54W, Symantec backup Exec 11d SP2 and LTO2/400GB Tapes.

when i perform a Full-backup all runs perfect. But in BackupExec it shows for each Tape "used Capacity: 196GB" with compression Ratio more or less than 1.20:1.
See Compresion settings in attached Printscreen.

How can i use full Capacity of my 400GB Tapes? it dosen't matter if the backupjob takes longer by higher compression ratio.

[Lewis Finch]

First, the tape drives uses hardware compression by default so do not use software compression. Second , if your files have already been compressed, for example through NTFS, you cannot further compress them. This is an excellent document that explains compression and what files compress better than others.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460