I have a Seagate DDS4 drive on a FreeBSD 6.2 server:

$ dmesg | grep ^sa
sa0 at sym0 bus 0 target 6 lun 0
sa0: <SEAGATE DAT    9SP40-000 912L> Removable Sequential Access SCSI-3 device
sa0: 40.000MB/s transfers (20.000MHz, offset 16, 16bit)

It's been working perfectly for a couple of years when using it and Amanda to 
make backups to the DDS3 tapes it inherited from the tape drive it replaced.  
However, I just recently went in on a set of Fuji DDS4 tapes with my 
employer.  Those tapes work perfectly in the office's DDS4 drive (name/model 
not available to me as I write this), but do nothing more than make my drive 
grind along until it starts flashing the cleaning light.

One thing I've wondered about is the mysterious set of undocumented DIP 
switches on the bottom of the drive.  The manual gives a list of OSes and the 
correct settings but doesn't actually explain what they do.  Since it doesn't 
include the positions for FreeBSD (but does for Novell 4.11 - go figure), I'm 
been using the Linux settings and hoping for the best.  Do any FreeBSD users 
have this model and an idea of what they should be set on?  I don't have any 
idea if that would even make a difference, but without having any clue what 
they actually do, who knows.

Many thanks to anyone who can shed a little light on this.  In the worst case, 
I'll keep using it as a DDS3 drive.  Still, I paid for DDS4 and would kind of 
like having the options to use it.
-- 
Kirk Strauser

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