Error while verifying a burned Ubuntu CD

DropDMG
1

Hi! Sorry if this is slightly off-topic but then again it may not be … :wink: When I burn a current Unbutu ISO image (7.10, i386) with DropDMG, I always get the error message Error

“Verification of the burn failed.” burning “ubuntu-7.10-desktop-i386.iso”

in the end.

This also happens with Disk Utility.

It does not, however, happen with Disco. (I didn’t bother to try Dragon Burn and I don’t own Toast.)

I’ve checked the MD5 hash on the image and it comes out all right. I’ve also let the resulting boot CD’s built-in self test run on a PC and it, too, reports that the CD has been burned properly.

So I’m just curious: Why do DropDMG and Disk Utility fail on the verification?

Thanks!

Chris

2

As far as I know, Disco uses the same disc burning framework as DropDMG and Disk Utility, so I wonder whether it simply isn’t reporting the error.

Do you mean that you verified that your .iso file has the proper hash? Or that you computed a hash of the burned CD (how?)?

I don’t know. Which version of Mac OS X are you using? Are you burning using an Apple-supplied optical drive? Is the .iso file available online so that I might try burning it on my Mac? Also, if you want I could send you a build of DropDMG that has more detailed error reporting.

3

I don’t know, of course. But the CDs that come out either way seem to be ok. I’ve actually re-downloaded the ISO image twice to be sure. From different servers.

Do you mean that you verified that your .iso file has the proper hash? Or that you computed a hash of the burned CD (how?)?

The former, yes, the latter, too, to the extend it’s possible via “built-in” means. The Ubuntu live CD’s boot menu offers an option to verify the integrity of the CD or rather the CD’s contents. AFAIK it’s a script that checks the hashes on the files on the CD.

I don’t know. Which version of Mac OS X are you using? Are you burning using an Apple-supplied optical drive? Is the .iso file available online so that I might try burning it on my Mac? Also, if you want I could send you a build of DropDMG that has more detailed error reporting.

I’m still on 10.4 (up-to-date) on an old 12" PowerBook G4 (867 Mhz) with the original DVD/CD-RW combo drive.

The Ubuntu ISOs are available via ubuntu.com.

If you like to investigate further, I’d take the “reporting build”. But I don’t want to make a big thing out of it. I was just curious …

4

For what it’s worth, I burned this file to CD using 10.4.11:

MD5 (ubuntu-7.10-desktop-i386.iso) = d2334dbba7313e9abc8c7c072d2af09c
DropDMG did not report an error, and it seemed to come out OK.

5

No luck here. I re-downloaded the image and checked the hash. I used the special build of DropDMG you supplied to me, but it doesn’t really report more than:

Error “Verification of the burn failed.” burning “ubuntu-7.10-desktop-i386.iso”

Anything else to try? I really don’t need another Ubuntu CD … %-)

(Actually I burned two but the location of the image, the “local” HD or an external FireWire HD, made no difference.)

6

Are you sure that you checked the log in the Console application?

7

No, I thought you meant DropDMG’s console …

Here’s—as far as I can tell—the relevant console.log output:

2007-12-28 20:17:46.420 DropDMG[23822] Failed for /Volumes/Externe Festplatte/ubuntu-7.10-desktop-i386.iso error {
DRErrorStatusErrorKey = -2147352477;
DRErrorStatusErrorStringKey = “Verification of the burn failed.”;
}
2007-12-28 20:39:16.286 DropDMG[23842] Failed for /Users/cb/Desktop/ubuntu-7.10-desktop-i386.iso error {
DRErrorStatusErrorKey = -2147352477;
DRErrorStatusErrorStringKey = “Verification of the burn failed.”;
}

And here the output from DiscRecording.log:

DropDMG: Burn started, Fri Dec 28 20:06:56 2007
DropDMG: Burning to CD-R media with SAO strategy in MATSHITA CD-RW CW-8122 BA21 via ATAPI.
DropDMG: Requested burn speed was max, actual burn speed is 24x.
DropDMG: Burn underrun protection is supported, and enabled.
DropDMG: Burn finished, Fri Dec 28 20:13:03 2007
DropDMG: Verify started, Fri Dec 28 20:13:03 2007
DropDMG: Verify failed, Fri Dec 28 20:17:41 2007
DropDMG: Burn started, Fri Dec 28 20:28:23 2007
DropDMG: Burning to CD-R media with SAO strategy in MATSHITA CD-RW CW-8122 BA21 via ATAPI.
DropDMG: Requested burn speed was max, actual burn speed is 24x.
DropDMG: Burn underrun protection is supported, and enabled.
DropDMG: Burn finished, Fri Dec 28 20:34:32 2007
DropDMG: Verify started, Fri Dec 28 20:34:32 2007
DropDMG: Verify failed, Fri Dec 28 20:39:11 2007

8

As far as I can tell, Apple does not document what that error code means. It seems that some other people are running into it, though.

9

For the sake of scientific inquiry I just downloaded and burned an OpenSUSE live CD (Gnome version)—and it verified fine. So there probably has to be some peculiarity about this particular Ubuntu image that the OS X (Tiger) burn framework under certain conditions doesn’t like. Strange, but oh well … %-)