[lug] dd i/o error

Wed Jun 5 08:16:22 MDT 2002

I've only had problems with severely scratched discs or with bad cdrom
drives.  The size comparison is probably due to dd re-trying the read.  I've
seen dd retry a read and get it after a few trys, so it may just be
perisistant and getting all the data even though it's having problems.

Try checking to see if DMA is enabled on the cdrom drive.  I had a system
once that turned DMA on by default on the cdrom and for some reason, it just
didn't get along with it worth a darn.  Turning it off cured the problem
(slightly older drive, though.)

> -----Original Message-----
> From: j davis [mailto:davis_compz at hotmail.com] 
> Sent: Wednesday, June 05, 2002 05:04
> To: lug at lug.boulder.co.us
> Subject: Re: [lug] dd i/o error
> 
> 
> 
> as a test i took a cd with very few scratches that has rh7.3 
> disk 1 on it, 
> did
> the "dd" i got a i/o error but when i compared the size of the
> output of dd (637.5mb) and the iso i downloaded from redhat 
> (637.5mb) ,
> then i tried again and i got no errors at all. is this common?
> 
> ?,
> jd
> 
> 
> 
> >From: "j davis" <davis_compz at hotmail.com>
> >Reply-To: lug at lug.boulder.co.us
> >To: lug at lug.boulder.co.us
> >Subject: [lug] dd i/o error
> >Date: Wed, 05 Jun 2002 10:24:25 +0000
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> >
> >hello,
> >
> >when i use this command
> >dd if=/dev/cdrom1 of=file.iso bs=2048
> >
> >i get a i/o error unless the cd i am copying
> >is brand new, some cd will copy futher than others,
> >so i was thinking of trying the "continue on error"
> >flag, but i want to know before i burn if this is
> >going to cause problems. I have been able to copy
> >the same cds using clonecd.I tried readcd it errors
> >and so does
> >cat /dev/cdrom1 > file.iso...i also tried
> >xcdroast , this seemed to work but left nero5.5 in
> >several diffrent tracks and file extensions. I just want one
> >..hell or two files that ezcd , nero, and cdrecord can burn.
> >can someone help :)
> >
> >thanks,
> >jd
> >
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