ISO is larger than DVD

brandonclone1

Honorable
Mar 26, 2014
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10,665
I am attempting to make a copy of a Lenovo recovery disc using ImgBurn

Step 1 - Create image file from disc (ISO)
Step 2 - Write image file (ISO) to blank disc

On step 1, the ISO it creates is 5.2GB, but DVDs are max 4.7GB, so I cannot burn the ISO to a blank disc

How is it possible that the ISO created from the recovery disc is larger than the disc itself? Is the data on the recovery disc compressed?