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Re: dd: error reading '/dev/sr0': Input/output error

On Monday 10 December 2018 02:34:48 md wrote:

> >> When copying a dvd to file on the harddrive, I'm getting the
> >> message dd: error reading '/dev/sr0': Input/output error
> >> If I first run dvdbackup, then Ctrl-C out of it. I can then reissue
> >> the dd command and it will finish fine. If I eject the dvd then
> >> insert another dvd, the same situation occurs.
> >
> > Classic slow spinup. You can get a better dvd drive that /might/ be
> > faster.
> You could be right. It hasn't been a problem in the past, but haven't
> needed to dd a disk in a while. To test your idea, what other spinup
> task do you suggest I substitute for dvdbackup?

You could try a two part invocation, dumping the first 3 or 4 megs 
to /dev/null with a real invocation separated by a ;
Another thought might be the head sliders are dry, and toothpick sized 
drop of light oil on the slider rods might be the ticket if you are up 
to cutting the laser warnings off the sheet metal and uncovering it long 
enough to apply the drop of oil, the fact that it reads 4 megs or so 
could indicate a stuck head carriage because the oil has evaporated, but 
the error recovery motions have made it move, and once moving, is ok 
until its set a bit and gotten suck again. I'd feel ok doing that but it 
does take removal of the covers on the bottom of the drive to access 
that area. Just be sure the power and data cables are off it so theres 
no chance of the laser coming on while the covers are off doing it. 
Those rails could be dirty, in which case not only oil, but qtips to 
clean up the first oil and the dirt, then oil again, but be carefull of 
bumping the head around. 

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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