Erasing a CD-RW

When you burn a CD-R disc, it cannot be burned again. But a CD-RW disc can be erased and burned again hundreds of times. (A CD-RW must be erased before it can be reused; you can't just continue burning without erasing.)

1. Go to Applications/Utilities and launch the Disk Utility.
2. When Disk Utility is running, insert the CDRW, which should show up in the left panel of the Disk Utility window.
3. Select the CDRW icon at left, and you should be able to click erase. A quick erase is much, much quicker than a full erase. Full erase is only necessary if you want all the data destroyed rather than just deleted.
4. When the erase completes, you may quit Disk Utility. Then burn the CD-RW as usual.