Burned CDs not initialized

I bought a SuperDrive to burn CDs with my iMac 21. I wanted to burn a CD that held 625 MB of audio tracks. I right-clicked the CD and created disk images in both .img and .cdr formats, but the disk images will not open, and the burned CDs do not mount.


Clicking on the disk images gets a warning that they can't be opened because of no mountable file systems.

CDs burned from the disk images will not mount, and Disk Utility says they are un-initialized.


I had to import the audio CD into my iTunes Library, then select all its tracks and burn a CD from iTunes.


What is my problem?

iMac, macOS High Sierra (10.13.1), 8 GB RAM, 256 GB SSD

Posted on Jul 10, 2018 7:30 AM

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Posted on Jul 11, 2018 8:25 AM

You cannot copy an audio CD using the contextual menu outside of iTunes and have the CD be recognized by CD players. The computer will only copy the files to the CD, not initialize it. Some CD players and DVD players will play the CD if the files are in mp3 format. You will need some type of burn app to create an audio CD playable as such.

Toast and I'm sure other burn apps have the ability to copy a CD as long it is not DRM protected.

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Jul 11, 2018 8:25 AM in response to vintage42

You cannot copy an audio CD using the contextual menu outside of iTunes and have the CD be recognized by CD players. The computer will only copy the files to the CD, not initialize it. Some CD players and DVD players will play the CD if the files are in mp3 format. You will need some type of burn app to create an audio CD playable as such.

Toast and I'm sure other burn apps have the ability to copy a CD as long it is not DRM protected.

Jul 11, 2018 10:14 AM in response to vintage42

I just want to copy an audio CD.

If you want to make a copy CD of the audio CD without importing into iTunes and then burning from iTunes do the following:


1 - insert the audio CD in your optical drive.

2 - launch Disk Utility.

3 - select the audio CD.

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4 - go to the File menu and select New Image ➙ Image from "Audio CD".

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5 - create a disk image.

6 - insert a new disc in the optical drive.

7 - Control (right) - click on the disk image and select "Burn Disk Image "Audio CD.img" to Disc...

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As a general note if you have the option to select the burn speed I would select a slow speed around 4x so you get the best burn possible (more time over each spot for the laser).

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Jul 11, 2018 10:16 PM in response to vintage42

Data CDs (and data and video DVDs) use 2,048 byte blocks, and have a directory of file names with block numbers.


Audio CDs have just a stream of bits. It starts with a TOC (Table of Contents) which contains the starting time of each track, The bits can be read in sectors of 2,352 bytes.

https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio


When Finder copies tracks from a CD it converts them into Audio Interchange File Format (AIFF).

https://en.wikipedia.org/wiki/Audio_Interchange_File_Format

It usually gets track names from an internet database.


A disk image file made from a Finder folder will be nothing like the bitstream on the CD. When burning a disc, Finder just copies 2,048 byte blocks. It doesn't do any reformatting.


Disk Utility can make a disk image file directly from a CD but it doesn't handle audio formats, so reads 2,048 byte blocks. The resulting disk image file is useless.


The only Apple software that can burn audio CDs is iTunes.


DVDs are different. They use 2048 byte blocks and have a directory that can be read by the Finder. If the DVD is not encrypted, Finder can copy the files to the computer and played (with the right software). DVD Player can play directly from encrypted DVDs, but not from encrypted files copied from the DVD. DVDs use UDF directories.

https://en.wikipedia.org/wiki/Universal_Disk_Format

Finder and Disk Utility can't create these, but UDF discs can be copied by Disk Utility disk images.

Jul 11, 2018 4:07 AM in response to garyfromrio linda

I just want to copy an audio CD. I would like to do that with the disc-burning features that I see offered in the contextual menus of High Sierra OS. But that method does create mountable disk images or CDs.


Are you saying my iMac will not copy an audio CD, and I will have to buy a burn app like Toast to do that?


I know I can import an audio CD into iTunes and burn tracks to a new CD. That was my workaround. But I did not want to clutter my Library with 20 unwanted tracks of opera music just to burn a CD of them. I want the Mac to copy the CD without using my iTunes Library.

Jul 11, 2018 6:31 PM in response to Old Toad

Those were beautiful instructions, and I went through them. They are the same as what I did four times before posting my question to this forum. The result was the same:

1- Clicking on the disk image gets a warning that it can't be opened because of no mountable file system.

2- The CD burned from the disk image will not mount, a message says it it not readable, and Disk Utility says it is un-initialized.


So I and Old Toad thought this procedure should work to copy a CD. It seems to be what Apple intended.. And yet it does not work with my iMac, High Sierra and new SuperDrive.


Is this normal, or do I have a problem, and where might it be?

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Burned CDs not initialized

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