Summary: HP 35480A SCSI DAT drive

From: Paul T. Root (
Date: Wed Dec 18 1991 - 15:43:24 CST

My original Posting:
> Arch: Sun4c
> OS: SunOS 4.1.1b
> DAT Drive: HP 25480A
>We have this DAT drive on and working in compressed mode. The manual claims
>that we should be able to get upto 8 Gig of data on a 90m tape. So far
>all I have been able to get is about 3 Gig in dump format ( using
>GTBackup from Alida, Inc.).
>The switches are set (1-8)
> 1 1 1 1 1 0 0 0
>And the kernel has been rebuilt using the data provided by HP. I have
>used many different combinations of density and tape lengths. HP suggests
>using 15000 for both.
>Does anybody have any insight as to how to get more onto a tape?
>Thanks. I will summerize.
Well, the votes are in and everybody says that 8Gig is a dream. I pretty
much knew that but I was hoping to get a bit more than 3Gig.

One person says he gets 2 - 2.5 Gig on a 60m tape. So 3 - 3.5 should be
doable for 90m - depending on the type of data you have, of course.

Also, the s and the d flags don't matter, just so long as they are large
enough so that dump doesn't think its about to hit the end.

Thanks to: (Arul Ananthanarayanan)
John DiMarco <> (Ingo Cyliax) (J. Matt Landrum)
dwells@fits.CX.NRAO.EDU (Don Wells)
Jim Lick <> (Eckhard Rueggeberg)
Dave Mitchell <>

And Special thanks to: ( Gordon C. Galligher)
who pointed out that I spelled summarize wrong. But, of course gave no useful
information on my question. Hi Gordon! (before anyone flames - he's a friend
of mine :-)


Paul T. Root	Nycor Corp
...a Perl script is correct if its's halfway readable and gets

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