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Date:      Sat, 14 Feb 1998 10:22:41 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Ustimenko Semen <semen@iclub.nsu.ru>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: Sony SDT-7000 Tape won't write 4Gig
Message-ID:  <19980214102241.18021@freebie.lemis.com>
In-Reply-To: <Pine.BSF.3.96.980213162358.8500A-100000@iclub.nsu.ru>; from Ustimenko Semen on Fri, Feb 13, 1998 at 04:26:34PM %2B0600
References:  <Pine.BSF.3.96.980213162358.8500A-100000@iclub.nsu.ru>

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On Fri, 13 February 1998 at 16:26:34 +0600, Ustimenko Semen wrote:
> On Thu, 12 Feb 1998, Greg Lehey wrote:
>
>> On Wed, 11 February 1998 at 19:51:36 +0600, Ustimenko Semen wrote:
>>> Hello!
>>>
>>> I have got Sony SDT-1700 device, but i can't get it work:(
>
>  As a wrote - it is SDT-7000 realy:)
>
>>> It should write 4 Gig on one
>>> DDS Cassete. But under 2.2.5-RELEASE write to /dev/rst0 fail
>>> on near 1 Gig.
>>>
>>> The seller tells it works fine under WinNT with 3d Service Pack.
>>> Is this the only way to make it work?
>>
>> No, that's a very bad way to make it work.  NT tape support is almost
>> non-existent.
>>
>> You don't say how you determined that you got to the end of the tape.
>> Programs like dump have their own idea of how big the tape is, and
>> will stop at this point even if you haven't got to EOT.  I don't know
>> dump, but it should be in the man page.  If you're getting this with
>> tar, something's seriously wrong.
>
> I wrote simple program, that fwrite to stdout random seeds, and to stderr
> - number of written bytes.
> Then i redirect output of my program to /dev/rst0, and on near 900Kb,
> program failed to fwrite due to i/o error. After i/o error any operations
> on /dev/rst0 cause messages from kernel, that it can't write to device.
> Else: the Cassete was used more than on 3/4.

Well, I'm sure you could rewind and try again.

> I use DDS-2, it shall ( as noticed) write 4G without and 8G with
> compression.

Can you send me the program?  You can put it on
ftp://ftp.lemis.com/incoming.

Greg

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