You can use Disk Utility or Disk Copy to burn to one CD-R disc two or more times until it is full, which is known as creating a multi-session CD.
For Mac OS X 10.4 Tiger
See this document for instructions.
For Mac OS X 10.2 through 10.3.9
To create a multi-session CD, use the Disk Copy utility to create a disk image file from which the CD is burned. Follow the steps below.
- Drag the item or items you wish to burn into a folder.
- Open Disk Copy (/Applications/Utilities/).
- Drag the folder onto the Disk Copy window. The Image Folder dialog appears.
- Choose a location for the image file using the Where pop-up menu. For simplicity, you may choose Desktop.
- Click Save. Wait for the image to be finished.
- Select Burn Image from the File menu. The image file should not be mounted.
- In the navigation dialog that appears, select the image you just created, then click Burn. If you have not already inserted a blank disc, you will be prompted to do so now.
- In the Burn Disc window, click the disclosure triangle.
- Select the checkbox for "Allow additional burns".
A disc burned with this setting will remain open to subsequent multi-session burns.
Additional burns on same disc
When performing additional burns on the multi-session disc, simply repeat Steps 1 to 7. The "Allow additional burns" setting selected in Steps 8 and 9 should automatically be retained for that disc on subsequent burns. Each new burn session on the disc will appear in the Finder as a separate disk, and it will have the name of the disk image file from which you burned it.