Re: [gentoo-user] Software for checking CDs and DVDs for errors?

[Dale]

Jack wrote:
> On 2018.12.03 11:27, Pouru Lasse wrote:
>> I've got a bunch of scratched disc-based games (PS2, Xbox 360) that I'd
>> like to check for errors. Is there any program for Linux that does this?
>> I found and tried dvdisaster, but it only works for CDs, not
>> DVDs. Everything else seems to be Windows-only.
>
> I have not installed dvdisaster, but I'd be really surprised if it
> won't check dvd's.  The ebuild description is "Tool for creating error
> correction data (ecc) for optical media (DVD, CD, BD)" so if it really
> balks at a dvd, I'd file a bug.
>
> Also - what is your criteria for finding an error?  Could you just
> read the entire disk or copy to /dev/null and just look for any read
> errors?  (I'm not sure if I'd try cp or dd or some variant on dd.)
>
> Jack
>


I was wondering if the checksums could be checked?  If the OP can find
the checksum for the DVD as it comes from the factory, then he could
check what he has against that.  Question is, is that info even
available or does it vary over batches of DVDs?  If it varies, it may
not be possible to test that way even if checksums are available. 

Thing that makes this different for the OP, a damaged audio or even a
video DVD can be corrected sometimes within the player itself.  I know
audio can and has done so for ages.  Video maybe, maybe not.  I suspect
video game DVDs fall more into the category of a data disk tho.  A
scratch may not be a problem with audio but when it comes to data, it
could be broken completely. 

Another thought, maybe if one is bad the maker would replace for a small
fee?? 

Just throwing that out there in case checksums are available and it
could be done that way.  Sort of doubt it tho. 

Dale

:-)  :-)