MAJ has answered a)
What bothers me is that your works computer "cannot read them!"
If I, in a blissfully ignorant state, had to do what you are doing I wouldn't expect to close the CD......... Honestly, for data, I don't do this anyway though doubtless lots of others will jump on me for good reasons.
If all else fails try burning at a slow rate, and avoid using the maximum that your burner will do.