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From: Mark Himsley <mark AT mdsh DOT com>
To: Corinna Vinschen <cygwin AT cygwin DOT com>
Subject: Re: /dev/nst0: Permission denied
Date: Wed, 05 Sep 2001 17:37:31 +0100
Message-ID: <t7kcpt0bjvv8eaovcofj4i5ncgrles7gds@4ax.com>
References: <4s3cpt4g1vvlqvodqfrhmqkp5p1spelu80 AT 4ax DOT com> <20010905141409 DOT H30380 AT cygbert DOT vinschen DOT de>
In-Reply-To: <20010905141409.H30380@cygbert.vinschen.de>
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Hi Corinna,

Sorry to have taken so long to come back to you, I was trying to get some
work done...

On Wed, 5 Sep 2001 14:14:09 +0200 you wrote:

>> $ cat /dev/nst0
>> cat: /dev/nst0: Permission denied
>> 
>> Why is this, and how can I read the DAT tape.
>
>Wrong blocksize. Call `mt -f /dev/nst0 status 2' with tape in
>drive.  It will show you the blocksize currently set in the
>NT tape device driver (often 512), e.g.:

Interesting thought. I was sure that I *had* done 'mt -f /dev/nst0 setblk
0' before I started, which was what I did just before I wrote the DAT in
Linux, but obviously I hadn't. You have solved that problem :-)

One other point. I have managed to completely lock-up Cygwin, requiring a
reboot to free up the DAT drive, by trying to `cat` a DAT tape which was
actually a `tar`. On Linux I get the error:

linux # cat /dev/nst0
cat: /dev/nst0: Cannot allocate memory

but on Cygwin `cat` hangs for ever and Cygwin has to be killed.
If I restart Cygwin and try to do anything with the DAT drive before
rebooting I get errors like:

Win2K $ mt -f /dev/nst0 status
TapeStatus: 6: The handle is invalid.

mt: Error reporting Tape status


Thanks for your help :-)

--
Mark Himsley
In Acton

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