I'm having a problem with a server. It has 9.1 Rev 4691.

The problem is a lot of soft read errors that are causing my compression
rate to be in the negative column (like .250:1 or .308:1). The drive is
fairly new as are the tapes.
I remote into the server, do a full erase on the tape and it worked fine. I
let one of the low compression tapes as is and it overwrote the tape
correctly one night but not the next.

I had the client run the cleaning tape through several times but no good.

Anyone heard of this?

I'm going to have the client erase all the tapes...