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Re: CD/DVD Verify



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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