Insert the CD or DVD disc in your computer's optical drive and select it in the list of disks and volumes.
Choose File > New > "Disk Image from (name of disc)."
Type a name for the disk image and choose an image format.
To require a password to access the contents of the disk image, choose "AES-128 (recommended)" from the Encryption pop-up menu.
Click Save.
When creating the disk image finishes, eject the original CD or DVD.
Select the disk image in the list and choose Images > Burn.
When the Burn Disc dialog appears, insert a blank CD or DVD.
To select additional options, such as making the disc appendable, click the triangle in the top-right corner.
Click Burn.