Mmm several things:
1. That media is crap I am afraid, just about the worst that is commonly available. Try an buy either Verbatim discs with a media ID of MCC or Taiyo Yudens with (TYG02 or TYG03). Any decent online retailer should list the media ID or supply it if asked. Yours is Disc ID: CMC MAG. AM3 and that could be the root of your problems.
2. You say it tried to burn at less than 1x as you can see the supported write speeds above are (Speeds: 4x, 8x, 12x, 16x), therefore I would guess that you are having problems with DMA. Read the FAQ here - http://forum.imgburn.com/index.php?s=&...dpost&p=967 and follow it to the letter. If you do this I think you should see an improvement in your burn speeds.
3. You may need a Firmware update, open ImgBurn and then right click on your drive description in the GUI, from the dropdown list select "Check for Firmware Update" and see if there is a newer firmware at www.rpc1.org.
Don't forget to change those discs tho !!