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Most Macs don't have built-in CD readers, so you'll need an external disc reader that's plugged into your Mac to do this. It's a menu item in the upper-left side of the Mac's screen. A drop-down menu will appear. If you don't see Go in the menu bar, click the Finder or the desktop to force it to appear. This option is near the bottom of the Go drop-down menu. Double-click the Disk Utility app, which resembles a grey hard drive with a stethoscope on it. It's in the top-left side of your Mac's screen. A drop-down menu will appear. This option is near the top of the drop-down menu. It's in the New pop-out menu. Clicking this prompts a window to open. Type the name that you want to use into the "Name" field at the top of the window. Click the drop-down box to the right of the "Where" heading, then click Desktop. This will make the file easier to convert later. A menu will appear. It's in the menu. It's at the bottom of the window. Doing so will gather the information on your CD and turn it into a CDR file on your desktop. While unnecessary if you're going to use this file on your Mac, the created CDR file won't work for a Windows computer. To convert the CDR file into an ISO file:  Open Spotlight {"smallUrl":"https:\/\/www.wikihow.com\/images\/e\/ea\/Macspotlight.png","bigUrl":"\/images\/thumb\/e\/ea\/Macspotlight.png\/30px-Macspotlight.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} and type in terminal  Click Terminal  Type in cd ~/Desktop and press ⏎ Return. Type in hdiutil makehybrid -iso -joliet -o [name].iso [name].cdr, making sure to replace both [name] sections with the CDR file's name. Press ⏎ Return. Your ISO file has now been created.

Summary:
Insert the disc into your Mac's CD reader. Click Go. Click Utilities. Open Disk Utility. Click File. Select New. Click Disk Image from [Disc]…. Enter a name for your ISO. Select a storage location. Click the "Image Format" drop-down box. Click DVD/CD master. Click Save. Convert the completed file into an ISO file. Close Terminal.