How to read .dat nero restore files?


I am new here, forgive me if I ask a dumm question. Some weeks ago burned an image of my HD to 23 cd’s with nero… Last week I had a crash because of which I had to dormat my HD. No problem, I thought, I have the image. When restoring at Cd #13 I got a message: write error. I have tried 2 times more, some outcome. I bought a new HD (it said WRITE error, right, so there must be something wrong with the HD, I thought), but rstoring to this new HD gave the same result.

My question: Is there a program that can read the .dat files on the backup CD’s? The files are all almost 700 Mb long.