On Mac you can use the following method to erase a “CD-RW/DVD±RW” disc. From here.

First, you can use “drutil”. drutil“ is a command line tool for Mac which interacts with CD/DVD disc, including burn, erase and eject. You can use the following commands to erase your “CD-RW/DVD±RW” discs.

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# "drutil" is a powerful tool far more than just erasing disc. You can use
# "man drutil" to get more details about how to use this command.

# List the available optical drive.
drutil list
# Erase the disc in the specific optical drive.
drutil -drive 1 erase full

Second, you can use “Finder” directly. In Finder, right click (or Ctrl + left click) on a “CD-RW/DVD±RW” disc, you will find an option to erase the disc in the contextual menu. Select it to proceed.