When go to restore and look at my media, the column that is supposed to tell me the size of the backup set has a question mark? Why is this? What I am really wanting to know is how much room I have left on my tape. Its DLT 4000 using DLT tape IV. I want to know what kind of compression ratio I am getting with the hardware compression. I there a utility I can use to look at the tape and find this out?