ubuntu boot cd unable to burn on disk utility

Question

I have downloaded the Iso file of ubuntu and I am trying to burn a boot cd from disk utility the burn goes all the way to the end and right before ejecting cd it read

Burn failed
2012-08-19 20:13:27 -0700:  The disc drive didn’t respond properly and can’t recover or retry.
2012-08-19 20:13:28 -0700:      Additional information can be found in the ~/Library/Logs/DiscRecording.log log file.
2012-08-19 20:13:28 -0700: Unable to burn “ubuntu-12.04-desktop-amd64.iso.” (The disc drive didn’t respond properly and can’t recover or retry.)

can anyone explain this do I have a bad superdrive or am I doing something else wrong I am on a mid 2007 macbook any support would be nice thank you.

Answer 1

You may have a bad iso file. Try re-downloading the iso again. To ensure that your iso downloaded correctly, check md5sum output from the Disk utility by selecting the iso file in Disk Utility, then go to the "Images" menu and select Checksum > MD5. Be sure to choose "MD5" and NOT "MD5 image checksum" or "CRC-32 image checksum", as they are not the same and will give you different results. Compare the result to the output shown below:

9fcc322536575dda5879c279f0b142d7 *ubuntu-12.04-alternate-amd64.iso
bcee4c03b704a9b62988505b7d8f3069 *ubuntu-12.04-alternate-i386.iso
128f0c16f4734c420b0185a492d92e52 *ubuntu-12.04-desktop-amd64.iso
d791352694374f1c478779f7f4447a3f *ubuntu-12.04-desktop-i386.iso
f2e921788d35bbdf0336d05d228136eb *ubuntu-12.04-server-amd64.iso
32184a83c8b5e6031e1264e5c499bc03 *ubuntu-12.04-server-i386.iso
d4aa1eb1131bacd46317dad1afc59ff6 *ubuntu-12.04-wubi-amd64.tar.xz
33452f884d1017aadde0ec468b83264c *ubuntu-12.04-wubi-i386.tar.xz
9813c75c0ef631942b4c9f989588ab85 *wubi.exe