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<TITLE>The Answer Guy 36:
More on: Reading Audio Tapes using HP-DAT Drive
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<!-- begin 93 -->
<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">
Reading Audio Tapes using HP-DAT Drive
</H3>
<p><strong>From Thomas Kruse on Fri, 25 Dec 1998
</strong></p>
<!-- ::
Reading Audio Tapes using HP-DAT Drive
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<BLOCKQUOTE>
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Hi!
I wonder, if you can help me with the following issue:
I bought a brand new SCSI HP-DAT streamer. In the manual it is described
to treat audio-dat tapes as if they were read-only.
I tried to fetch the data from the tape, but I get always i/o erorrs. (I
tried "cat <TT>/dev/st0</TT>" "dd if=/dev/st0...")
Do I need special software or is it impossible to "read" audio tapes
with Linux? (I heard rumors, that this is possible with special Win95
software)
</STRONG></P>
<P><STRONG>
Regards, Thomas
</STRONG></P>
<P><STRONG>
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
That's an excellent question. I have absolutely no
idea. I guess you could look at the Linux st driver
sources and see if they need to be changed. I guess
you might even write to the author or maintainer of the
st driver to ask for advice.
</BLOCKQUOTE>
<BLOCKQUOTE>
Looking under <TT>/usr/src/linux</TT>
I find, in <TT>.../drivers/scsi/st.c</TT> that the 2.0.36 sources
list Kai Makisara as the author. I've blind copied his
addresses on this response.
</BLOCKQUOTE>
<BLOCKQUOTE>
Kai, thanks for the work on the 'st' driver. What
would prevent one from reading audio tapes using
<TT>/dev/stX</TT> under Linux?
</BLOCKQUOTE>
<BLOCKQUOTE>
I'm sorry if you're getting two copies of this
I wasn't sure which address from the st.c file to use.
</BLOCKQUOTE>
<BLOCKQUOTE>
(Note: this message is in response to a Linux Gazette
"Answer Guy" question. I'll be happy to post any response
--- which may end up prevent future questions on this
topic. If this is buried in an FAQ, HOWTO, or man page
somewhere, please point us at it and forgive us for not
finding it).
</BLOCKQUOTE>
<!-- sig -->
<!-- end 93 -->
<hr width="40%" align="center">
<!-- begin 87 -->
<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">
More on: Reading Audio Tapes using HP-DAT Drive
</H3>
<p><strong>From Kai Makisara on Sat, 26 Dec 1998
</strong></p>
<!-- ::
More on: Reading Audio Tapes using HP-DAT Drive
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
There are (at least) two issues when using audio DAT tapes in a computer
DAT drive:
</STRONG></P>
<P><STRONG><ol>
<li>You may or may not be successful in using audio media to record
digital data. The tape cartridge does not contain the MRS (Media
Recognition System) identification data that most of the digital
tapes nowadays have. The drive uses this data to determine the
tape length, etc. By default, the HP drives I have seen treat any
non-MRS tapes read-only. You can change this with a switch. I
assume this is what the HP manual means but not what you are
interested in.
<li>You may be able to read audio data using a computer DAT. This
depends on the firmware of the DAT driver. As far as I know, most
computer DAT drives are unable to read audio data. There have been
some drives from Silicon Graphics that were able to read audio
data. As far as I know, they were ordinary Archive DATs with
special firmware. You needed special SCSI commands to read audio
data (I don't know the commands).
</ul></STRONG></P>
<P><STRONG>
The Linux SCSI tape driver does not currently have any support for
reading audio data.
</STRONG></P>
<P><STRONG>
Kai
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Thanks Kai.
</BLOCKQUOTE>
<BLOCKQUOTE>
I presume this is a result of the music industry's
lobbying. The big record companies (Sony, Columbia,
et al) have been interferring with the digital
electronics industry for years in a misguided effort
to discourage bootlegging.
</BLOCKQUOTE>
<BLOCKQUOTE>
Oh well. We're already at the stage where some people
are providing free writing --- the beginnings of an
"open content" movement. This will probably encompassing
music and literature much as the "open source (TM)" movement
has made an impact on software.
</BLOCKQUOTE>
<BLOCKQUOTE>
I don't object to spending money on a good book or
a decent CD. I'd just like to see more of it go to
the artist and I'd like some assurance that corporate
politics and big business aren't exerting undue control
over the contents. However, I'll leave it at that before
this becomes overly political (and overtly subversive).
</BLOCKQUOTE>
<!-- sig -->
<!-- end 87 -->
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<P> <hr> <P>
<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 36 January 1999</H5>
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