[ale] dd /dev/cdrom queryosity

[Chris Fowler]

The error is okay.  I would add the block size of 2048 to the command.  

The dd command has no way of knowing how big the ISO image is.  It just
read until it falls off the end and then displays an error.  So replace
"Input/Output error" with "Reached end of media"


On Sat, 2004-05-08 at 13:15, aaron wrote:
> I'm ripping some distro CD's to burn copies, eg:
> 
>        dd  if=/dev/cdrom  of=/mydir/distro1x4.iso
> 
> The CD's seem to be reading fine and the ISO's are getting generated, but dd 
> is reporting an exit error after completing process:
> 
>       dd: reading `/dev/cdrom': Input/output error
> 
> The first test burn from one of the generated ISO's still seemed to come out 
> OK. The byte counts of the duplicate CD match the original, and the new CD 
> boots up without problems. 
> 
> According to a couple HOWTO pages, the dd command line is correct and no other 
> flags or options are suggested.  I just don't recall seeing this error noted 
> in the past, though I'm not sure if I've done any data rips with this 
> particular CD writer, which is a fairly recent upgrade. Tried un-mounting the 
> cdrom before running dd but still saw the error.
> 
> Mostly a queryosity since the ripped ISO's and resultant CD's seem to be fine, 
> but any guesses as to WHY I am seeing this error?
> 
> thanks
> peace
> aaron
> 
> 
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