Groups > comp.os.linux.development.system > #752

Re: dd and IO

From	"Bill Cunningham" <billcun-remove-@suddenlink.net>
Newsgroups	comp.os.linux.development.system
Subject	Re: dd and IO
Date	2016-04-17 15:11 -0400
Organization	A noiseless patient Spider
Message-ID	<nf0mua$b2m$1@dont-email.me> (permalink)
References	(2 earlier) <netq2c$4sh$1@dont-email.me> <slrnnh4otc.5q5.grahn+nntp@frailea.sa.invalid> <slrnnh4svo.5q5.grahn+nntp@frailea.sa.invalid> <neuf54$ev9$1@dont-email.me> <slrnnh5tf1.5q5.grahn+nntp@frailea.sa.invalid>

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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

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dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-14 14:22 -0400
  Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-14 14:22 -0400
  Re: dd and IO John Reiser <jreiserfl@comcast.net> - 2016-04-15 05:19 -0700
  Re: dd and IO Joe Beanfish <joebeanfish@nospam.duh> - 2016-04-15 14:16 +0000
    Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-15 17:49 -0400
  Re: dd and IO Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-04-15 17:12 -0600
    Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-16 12:46 -0400
      Re: dd and IO Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-04-16 20:18 +0000
        Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-16 17:21 -0400
        Re: dd and IO Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-04-16 21:27 +0000
          Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-16 18:12 -0400
            Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-16 18:16 -0400
          Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-16 18:46 -0400
            Re: dd and IO Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-04-17 06:43 +0000
              Re: dd and IO "Bill Cunningham" <billcun-remove-@suddenlink.net> - 2016-04-17 15:11 -0400
                Re: dd and IO Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-04-19 15:33 +0000

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