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Date:      Tue, 14 Dec 1999 15:36:40 -0500 (EST)
From:      Adon <ahwang@fas.harvard.edu>
To:        freebsd-questions@freebsd.org
Subject:   DDS-4 set density woes
Message-ID:  <Pine.OSF.4.10.9912141531400.5936-100000@is04.fas.harvard.edu>

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hello,

i have a HP SureStore DAT40i (HP C5683A C908).  it is a DDS-4 drive that
purports to write to smaller formats such as DDS-2 or DDS-3.  my problem
is when i try to write to a DDS-2 tape.  in its default configuration, i
cannot write the full capacity of the tape (4 GB uncompressed).  with
hardware compression turned on, i get about 3.6 GB on a tape.

mt status shows:

# mt status
Mode      Density              Blocksize      bpi      Compression
Current:  0x26:DDS-4           1024 bytes     97000    enable
---------available modes---------
0:        0x26:DDS-4           1024 bytes     97000    enable
1:        0x26:DDS-4           1024 bytes     97000    enable
2:        0x26:DDS-4           1024 bytes     97000    enable
3:        0x26:DDS-4           1024 bytes     97000    enable
---------------------------------
Current Driver State: at rest.



mt density shows:

# mt density DDS-2
Using "DDS-2" as an alias for 0x24:DDS-2


however, status immediately after the density setting shows no change!

is the tape drive smarter than i think it is but doesn't show the correct
density setting?

thanks,
adon



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