Need help making images from backups

Hello.

I have a few backups of DC games that I own. I just started getting into DC emulation for the first time, messing with null and demul. I realize these emulators only take images. I tried making cdi images with discjuggler. Out of 5 of my backups, I was only able to make images for 3 of them. Discjuggler gave me a error message says "Unable to read TOC, PMA or subcode" for the other 2 backups. I thought the CDRs went bad, but when I put them in my DC console, they ran fine. Does anyone have solutions for this? Thanks.

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