I seem to be having a bit of a problem I don't understand. I've never
tried this before with CD/DVDs. I have a CD/RW that windows says is CDFS.
Linux doesn't quite identify it. Ok I want to clea or zreo this out with dd.
I can use a burner utility and erase this. With dd I get data no longer
async. Something about page (memory?) and sectors written and read.

I don't know all the conv= and ibs= or obs= alters. But tried this.

dd if=/dev/zero of=/dev/sr1 and I tried,

dd if=/dev/zero of=/dev/sr1 bs=1024 count=2

Both give me these errors. It is a USB DVD/RW. I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get data errors. What's going on?

Bill

--- SoupGate-Win32 v1.05
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"Bill Cunningham" <billcun-remove-@suddenlink.net> wrote in message news:neomud$qc2$1@dont-email.me...

I seem to be having a bit of a problem I don't understand. I've never tried this before with CD/DVDs. I have a CD/RW that windows says is CDFS. Linux doesn't quite identify it. Ok I want to clea or zreo this out with
dd. I can use a burner utility and erase this. With dd I get data no
longer async. Something about page (memory?) and sectors written and read.

I don't know all the conv= and ibs= or obs= alters. But tried this.

dd if=/dev/zero of=/dev/sr1 and I tried,

dd if=/dev/zero of=/dev/sr1 bs=1024 count=2

Both give me these errors. It is a USB DVD/RW. I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get data
errors. What's going on?

Bill

Oh and I'm using Fedora 20 if that means anything.

--- SoupGate-Win32 v1.05
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I have a CD/RW that windows says is CDFS.
Linux doesn't quite identify it. Ok I want to clea or zreo this out with dd. I can use a burner utility and erase this. With dd I get data no longer async. Something about page (memory?) and sectors written and read.

Post here a transcript (copy+paste) that shows each command
that you gave, and the exact response you received.

--- SoupGate-Win32 v1.05
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On Thu, 14 Apr 2016 14:22:12 -0400, Bill Cunningham wrote:

I seem to be having a bit of a problem I don't understand. I've never
tried this before with CD/DVDs. I have a CD/RW that windows says is
CDFS. Linux doesn't quite identify it. Ok I want to clea or zreo this
out with dd.
I can use a burner utility and erase this. With dd I get data no longer async. Something about page (memory?) and sectors written and read.

I don't know all the conv= and ibs= or obs= alters. But tried this.

dd if=/dev/zero of=/dev/sr1 and I tried,

dd if=/dev/zero of=/dev/sr1 bs=1024 count=2

Both give me these errors. It is a USB DVD/RW. I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get data
errors. What's going on?

Bill

CDs/DVDs are odd beasties. In the old days cdrecord was the way to deal
with them. Looks like Fedora is moving to libburn??

--- SoupGate-Win32 v1.05
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"Joe Beanfish" <joebeanfish@nospam.duh> wrote in message news:neqt38$615$2@dont-email.me...

CDs/DVDs are odd beasties. In the old days cdrecord was the way to deal
with them. Looks like Fedora is moving to libburn??

I think I'm moving to gentoo or archlinux. Fedora puts out a new OS seemingly once a year.

Bill

--- SoupGate-Win32 v1.05
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"Bill Cunningham" <billcun-remove-@suddenlink.net> writes:

I seem to be having a bit of a problem I don't understand. I've never tried this before with CD/DVDs. I have a CD/RW that windows says is CDFS. Linux doesn't quite identify it. Ok I want to clea or zreo this out with dd. I can use a burner utility and erase this. With dd I get data no longer async. Something about page (memory?) and sectors written and read.

I don't know all the conv= and ibs= or obs= alters. But tried this.

dd if=/dev/zero of=/dev/sr1 and I tried,

dd if=/dev/zero of=/dev/sr1 bs=1024 count=2

Both give me these errors. It is a USB DVD/RW. I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get data errors. What's going on?

Bill

You can't write to a CD/DVD with dd. You have to use burning software
that understands the media.

--- SoupGate-Win32 v1.05
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"Joe Pfeiffer" <pfeiffer@cs.nmsu.edu> wrote in message news:1b37qmv543.fsf@pfeifferfamily.net...

You can't write to a CD/DVD with dd. You have to use burning software
that understands the media.

With dd I am trying to read from a CD/R and write an ISO. That might be
the problem. The CD/R isn't an ISO 9660. So it's not going to copy to a file
I am creating called xpmce1.iso is it. Ihave XP MCE on 3 CD/Rs. They are
pretty old. One is damaged. IDK if I can get it copied with ddrescue or dd_rescue or not.

Bill

--- SoupGate-Win32 v1.05
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On Sat, 2016-04-16, Bill Cunningham wrote:

"Joe Pfeiffer" <pfeiffer@cs.nmsu.edu> wrote in message news:1b37qmv543.fsf@pfeifferfamily.net...

You can't write to a CD/DVD with dd. You have to use burning software
that understands the media.

With dd I am trying to read from a CD/R and write an ISO.

That wasn't very obvious in your first postings; I interpreted it the
way JP did, too.

That might be the problem. The CD/R isn't an ISO 9660.

Doesn't almost every CD-ROM use that file system? What does it use
instead, and how do you know?

So it's not going to copy to a file I am creating called xpmce1.iso
is it.

Of course it is! dd doesn't care how you name your files. And it
doesn't care what file system it is -- it just copies blocks of data.

/Jorgen

--
// Jorgen Grahn <grahn@ Oo o. . .
\X/ snipabacken.se> O o .

--- SoupGate-Win32 v1.05
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"Jorgen Grahn" <grahn+nntp@snipabacken.se> wrote in message news:slrnnh4otc.5q5.grahn+nntp@frailea.sa.invalid...

On Sat, 2016-04-16, Bill Cunningham wrote:

"Joe Pfeiffer" <pfeiffer@cs.nmsu.edu> wrote in message
news:1b37qmv543.fsf@pfeifferfamily.net...

You can't write to a CD/DVD with dd. You have to use burning software
that understands the media.

With dd I am trying to read from a CD/R and write an ISO.

That wasn't very obvious in your first postings; I interpreted it the
way JP did, too.

Sorry. I have tried several things. In addition to the /dev/zero device.

That might be the problem. The CD/R isn't an ISO 9660.

Doesn't almost every CD-ROM use that file system? What does it use
instead, and how do you know?

XP says it's CDFS. I think that's an older format.

So it's not going to copy to a file I am creating called xpmce1.iso
is it.

Of course it is! dd doesn't care how you name your files. And it
doesn't care what file system it is -- it just copies blocks of data.

That's what I thought. I have read to that it wants to cache.
iflag=nocache I have tried and oflag=direct that doesn't work.

Bill

--- SoupGate-Win32 v1.05
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On Sat, 2016-04-16, Jorgen Grahn wrote:

On Sat, 2016-04-16, Bill Cunningham wrote:

"Joe Pfeiffer" <pfeiffer@cs.nmsu.edu> wrote in message
news:1b37qmv543.fsf@pfeifferfamily.net...

You can't write to a CD/DVD with dd. You have to use burning software
that understands the media.

With dd I am trying to read from a CD/R and write an ISO.

That wasn't very obvious in your first postings; I interpreted it the
way JP did, too.

Going back, what actually happened was you asked one question (about
zeroing a CD-RW), then changed the subject and asked another. JP
replied to the first one. It now seems you're more interested in this
second one:

I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get
data errors. What's going on?

Well, that should work if you are root (so you can create files in /)
and the CD isn't broken. If it's broken you should

- get an error message from dd
- /xpmce.iso will not be complete
- and probably you'll find complaints from the kernel in /var/log/.

/Jorgen

--
// Jorgen Grahn <grahn@ Oo o. . .
\X/ snipabacken.se> O o .

--- SoupGate-Win32 v1.05
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"Jorgen Grahn" <grahn+nntp@snipabacken.se> wrote in message news:slrnnh4svo.5q5.grahn+nntp@frailea.sa.invalid...

Going back, what actually happened was you asked one question (about
zeroing a CD-RW), then changed the subject and asked another. JP
replied to the first one. It now seems you're more interested in this
second one:

I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get
data errors. What's going on?

Well, that should work if you are root (so you can create files in /)
and the CD isn't broken. If it's broken you should

- get an error message from dd
- /xpmce.iso will not be complete
- and probably you'll find complaints from the kernel in /var/log/.

Well it didn't. I always believed dd was raw data, binary. I booted into XP
and erased the CD with CD/DVD erase/burn tools and it's ready to be written
to again. So the CD isn't broke. I will try with another CD tomorrow. will save and post the errors.

Bill

--- SoupGate-Win32 v1.05
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On Sat, 2016-04-16, Bill Cunningham wrote:

OK well. I don't know what to say. I used this and it worked,

dd if=/dev/sr1 of=/xpmce1.iso iflag=nocache oflag=direct

I suspect that just "dd if=/dev/sr1 of=/xpmce1.iso" would have
worked, too.

The copy was made of 650 MB or so. Not so much as a hiccup. Well one of
these CDRs is damaged. I will have to try ddrescue with it. Thanks for the help. I hope I haven't bothered anyone too much.

You haven't, but you are often hard to follow. (Communication is
difficult, so that's not surprising.)

Maybe those flags helped or not.

I think not, but yes.

/Jorgen

--
// Jorgen Grahn <grahn@ Oo o. . .
\X/ snipabacken.se> O o .

--- SoupGate-Win32 v1.05
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"Bill Cunningham" <billcun-remove-@suddenlink.net> wrote in message news:neud6b$f0$1@dont-email.me...

"Jorgen Grahn" <grahn+nntp@snipabacken.se> wrote in message news:slrnnh4svo.5q5.grahn+nntp@frailea.sa.invalid...

Going back, what actually happened was you asked one question (about
zeroing a CD-RW), then changed the subject and asked another. JP
replied to the first one. It now seems you're more interested in this
second one:

I am also trying this and getting errors.

dd if=/dev/sr1 of=/xpmce.iso

I want to write an ISO 9660 XP MCE OS CD/R into a ISO. And get
data errors. What's going on?

Well, that should work if you are root (so you can create files in /)
and the CD isn't broken. If it's broken you should

- get an error message from dd
- /xpmce.iso will not be complete
- and probably you'll find complaints from the kernel in /var/log/.

Well it didn't. I always believed dd was raw data, binary. I booted into
XP and erased the CD with CD/DVD erase/burn tools and it's ready to be written to again. So the CD isn't broke. I will try with another CD
tomorrow. will save and post the errors.

Bill

Wait a minute scratch that. I am all confused today. That was another CD
a CD-RW. Ok with the CD/R of course it's mounting in linux and I can go in
and read that data. One of these CDs I know is defective. But not this one.
I have tried 2 CD/Rs actually and got the same results. I'll get back
tomorrow.

Bill

--- SoupGate-Win32 v1.05
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"Jorgen Grahn" <grahn+nntp@snipabacken.se> wrote in message news:slrnnh5tf1.5q5.grahn+nntp@frailea.sa.invalid...

On Sat, 2016-04-16, Bill Cunningham wrote:

OK well. I don't know what to say. I used this and it worked,

dd if=/dev/sr1 of=/xpmce1.iso iflag=nocache oflag=direct

I suspect that just "dd if=/dev/sr1 of=/xpmce1.iso" would have
worked, too.

The copy was made of 650 MB or so. Not so much as a hiccup. Well one of
these CDRs is damaged. I will have to try ddrescue with it. Thanks for
the
help. I hope I haven't bothered anyone too much.

You haven't, but you are often hard to follow. (Communication is
difficult, so that's not surprising.)

Maybe those flags helped or not.

I think not, but yes.

OK no error has stopped copying but this is what I have gathered from one created IO.

blk_update... critical medium error sector 1244192
IO_error sector 1244240
IO_error logical block 311060 async page read

1244240 in
1244240 out
637 MB

Will dd not stop if there's an error and just keep copying? I think what I
did before is plugin my USB DVD/RW and try to use it too fast. When I wait
for recognition (you know serial, slow, especially USB) errors are printed.
I use dd and there's no problem. Basically before I jumped in too fast and
got those errors.

But copying is not breaking. Should I run ddrescue over these ISO 9660s?

Bill

--- SoupGate-Win32 v1.05
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On Sun, 2016-04-17, Bill Cunningham wrote:

"Jorgen Grahn" <grahn+nntp@snipabacken.se> wrote in message news:slrnnh5tf1.5q5.grahn+nntp@frailea.sa.invalid...

On Sat, 2016-04-16, Bill Cunningham wrote:

OK well. I don't know what to say. I used this and it worked,

dd if=/dev/sr1 of=/xpmce1.iso iflag=nocache oflag=direct

I suspect that just "dd if=/dev/sr1 of=/xpmce1.iso" would have
worked, too.

The copy was made of 650 MB or so. Not so much as a hiccup. Well one of
these CDRs is damaged. I will have to try ddrescue with it. Thanks for
the
help. I hope I haven't bothered anyone too much.

You haven't, but you are often hard to follow. (Communication is
difficult, so that's not surprising.)

Maybe those flags helped or not.

I think not, but yes.

OK no error has stopped copying but this is what I have gathered from one created IO.

blk_update... critical medium error sector 1244192
IO_error sector 1244240
IO_error logical block 311060 async page read

That does not seem good.

1244240 in
1244240 out
637 MB

Will dd not stop if there's an error and just keep copying?

My guess was that it will not, but I can be wrong.

Looking at the manual, it doesn't say anything explicitly. However
there is a 'noerror' option to "continue after read errors" so I
suppose if you don't enable it, it should stop at the first read
error.

I think what I did before is plugin my USB DVD/RW and try to use it
too fast. When I wait for recognition (you know serial, slow,
especially USB) errors are printed. I use dd and there's no
problem. Basically before I jumped in too fast and got those errors.

Hm ... you shouldn't get errors just by plugging in the device.

But copying is not breaking. Should I run ddrescue over these ISO 9660s?

No idea; I haven't used it. Sorry.

/Jorgen

--
// Jorgen Grahn <grahn@ Oo o. . .
\X/ snipabacken.se> O o .

--- SoupGate-Win32 v1.05
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OK well. I don't know what to say. I used this and it worked,

dd if=/dev/sr1 of=/xpmce1.iso iflag=nocache oflag=direct

The copy was made of 650 MB or so. Not so much as a hiccup. Well one of
these CDRs is damaged. I will have to try ddrescue with it. Thanks for the help. I hope I haven't bothered anyone too much. Maybe those flags helped or not.

Bill

--- SoupGate-Win32 v1.05
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