Thanks to all for their helpful suggestions.  I've determined that we have a combination of old tapes and a lot of data.

And, Mr. Dolliver's email led me to the REPORT command that helped me find 8GB of data that I don't need to back up.

Since we're planning on retiring my beloved HP3000 around December, 2014, I think we're good.

Again, thanks and merry Christmas to all.

Ernie

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of Jon Ose
Sent: Wednesday, December 11, 2013 8:04 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Backup question

> Ocasionally the backup requests a second tape and I'm not sure if
> we're

> really reaching the limit of a DDS-3, or some of my tapes are bad.

Do you track tape usage? DDS tapes are formatted into groups. As these groups are used they can be marked as bad, due to among other things: too many uses, too many errors. Thus, they will become logically 'shorter' over time.

Jon


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