Adapted From: Mac OSX Hints at The Mac Dev Center
Most people think that you need a program like Roxio Toast to record a CD-R disc more than once in Mac OS X. On the contrary, Disk Copy lets you burn a single CD as many times as you like! That's right, regular cheapie CD-R discs, not CD-RW (rewriteable).
What you'll create here is a multisession disc. Each time you burn more material onto it, you create a new disc icon that will appear separately when you insert the CD. Here's how to go about it:
Prepare For Burning: Prepare the material you intend to burn the first time. For example, put it all into a folder on your desktop.
1. Open Disk Copy. Choose File-> New-> Image from Folder or Volume.
When prompted, navigate to, and select, the folder you want to burn, and then click Image. You're asked to name the disk image you're creating.
2. Type a name for the image, specify a location (like the desktop), and then click Save. In this example, suppose it's called Typestyles.dmg.
3. When you're ready to burn, open Disk Copy. Choose File->Burn Image. Navigate to the disk image (Typestyles.dmg), and click it once. Then click Burn. The Burn Disc dialog box appears. Expand the box as shown
4. Turn on "Allow additional burns," as seen in the screenshot above.
Click Burn to record the material onto the CD.
Disk Copy does its thing, burning your CD as though it's the first and last time. But boy, do you have a surprise for it.
5. When it comes time to add new material to that disc, repeat steps 1 through 4.
This time, in the expanded dialog box, you'll see that "Allow additional burns" is still turned on. Instead of Burn, though, the lower-right button now says Append. That's your clue that Disk Copy understands what it's about to do: add information to an existing CD, resulting in a second disk icon on the desktop containing only the new material.
6. Click Append. You've just created a multisession disc!
You can repeat steps 6 and 7 over and over again, adding more and more material to a disc -- or at least until it's full.