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Date:      Wed, 29 Apr 1998 10:33:42 -0600
From:      Chris Faehl <cfaehl@cs.unm.edu>
To:        freebsd-hardware@FreeBSD.ORG
Subject:   Numbers/Densities for ARCHIVE Python 04106-XXX 715G
Message-ID:  <E0yUZnl-0005IJ-00@enterprise.cs.unm.edu>

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I'm trying to obtain 'optimal' settings for a Seagate DDS-3 drive,
ARCHIVE Python 04106-XXX 715G. Kernel (2.2.6, btw) sez:
ahc0:A:6: refuses WIDE negotiation.  Using 8bit transfers
(ahc0:6:0): "ARCHIVE Python 04106-XXX 715G" type 1 removable SCSI 2

'mt -f /dev/rst0 status' sez:
Present Mode:   Density = 0x25         Blocksize variable
---------available modes---------
Mode 0:         Density = 0x00         Blocksize variable
Mode 1:         Density = X3.136-1986  Blocksize = 512 bytes
Mode 2:         Density = X3.39-1986   Blocksize variable
Mode 3:         Density = X3.54-1986   Blocksize variable

I'm not finding any corresponding info for density = 0x25 on a 
man mt, nor do I find any corresponding values in <sys/mtio.h>.

What to do? I'd like to have access to compressed devices, none of
the modes appear relevant. I'm a little confused about where I 
should specify density values - and what values I should use. 

Is this enough info to get a coherent answer? Or am I omitting some
vital info? And, does anyone know what bpi this device supports?
Seagate's docs are, um, suboptimal. I scanned the mail archives and 
the FAQ/Handbook, to no avail.



-------------------------------------------------------------------------------
Chris Faehl			      | Email: cfaehl@cs.unm.edu
The University of New Mexico          | URL:   http://www.cs.unm.edu/~cfaehl
Computer Science Dept., Rm. FEC 313   | Phone: 505/277-3016
Albuquerque, NM  87131  USA           | FAX:   505/277-6927
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