Live USB "Check disk for defects” finds defects but doesn't list them

I downloaded the iso file for XUbuntu. I created a live usb using Pen Drive Linux. I turned on my computer, booted to the XUbuntu installation screen, and selected "check disk for defects".

A minute later, it says that it found one defect. How do I figure out what this defect is?

Solution 1:

“Check disk for defects” will compare the checksums of the files on the USB drive against a known good list. The result means there was an error transferring the Xubuntu live system to the USB drive.

• Did you follow the official instructions to create a bootable USB drive?
• Did you check the integrity of the downloaded ISO image? In case of an error here, re-download the image.