Re: CD/DVD Verify

[alan <alan clueserver org>]

On Wed, 13 Sep 2006, Jonathan Allen wrote:

> Brad,
>
> > I *believe* what a lot of verification processes do (like checking the
> > CD/DVD when you install various Linux flavors) is it actually holds
> > checksums of the important files that it burned, and then mounts the CD
> > and computes and compare those checksums to make sure they match up.
>
> OK, that would imply that I do need to mount the burned media and compare
> the individual contents.
>
> > Or maybe you could compute the checksum on the ISO and then compare it
> > to the CD?
>
> I get media errors trying to simply access the device.
>
>   # md5sum -b /dev/cdrom
>
>   hdc: command error: status=0x51 { DriveReady SeekComplete Error }
>   hdc: command error: error=0x50 { LastFailedSense=0x05 }
>   ide: failed opcode was: unknown
>   end_request: I/O error, dev hdc, sector 1760
>   printk: 12 messages suppressed.
>   Buffer I/O error on device hdc, logical block 220
>
>   <this then repeats for section 1768, block 221, 1776/222 and so on>
>
> Any ideas ?

Have you tried a known good disc and see if you get the same type of 
errors?

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