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From: Jean-Marc Zucconi <jmz@FreeBSD.ORG>
To: mandrews@termfrost.org
CC: freebsd-hardware@FreeBSD.ORG
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	<Pine.BSF.4.05.9810272322520.20447-100000@mindcrime.termfrost.org>
	(message from Mike Andrews on Tue, 27 Oct 1998 23:28:07 -0500 (EST))
Subject: Re: Sony SDT-5000 hardware compression?
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>>>>> Mike Andrews writes:

 > I'm having problems making hardware compression work on a Sony SDT-5000
 > tape drive, which is supposed to be a DDS-2 drive.  90 meter tapes are
 > filling up at the 2 gig mark -- I should be able to get at least 3 or so

You must remove the 'DC' jumper to enable compression (and probably do
a power cycle). This is how my SDT5000 worked. From the Sony FAQ:

   Q: How does one enable or disable compression on the SDT-5000/5200    
   tape drive?                                                           
   A: Please note the difference between software compression and
   hardware compression.      
   Software compression is handled by the software external to the drive.
   Toggling hardware                                                          
   compression can be done by issuing a SCSI Mode Select to the drive or
   simply by setting a                                                  
   jumper. Please refer to the SDT-5000 Jumper Setting document. A FAX
   copy of the                                                   
   document can be obtained by calling the Sony FAX Retrieval System at
   1-800- 883-7669,                                                      
   document 5761.


Jean-Marc

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