Evidently there is a problem with the eRecovery software. I had the same problem. Spent most of the day creating a set of 10 eRecovery CDs, only to get this error on CD #10. Tried 3 other CDs, same problem. Thought maybe the drive was overheated, so I let it sit for a few hours and tried again. Same issue. The netbook and other computers recognized the media as being empty. I finally gave up and pulled a DVD+R/RW out of another machine and hooked it up and started over making DVDs this time. First one burns fine, second and last one gives the 0x203 error.
Since they are sister companies, I thought this might work but it didn't. Finding any help on the Acer site was a challenge, as they don't list support as an option at the top of their home page like every other tech company on the planet. If you look at the bottom left of the page, you'll find a Products and Services link. That will lead to a page listing their various brands and under each brand is a Tech Support link. From there you have to specify your particular machine (4 steps) and then look for a link on the left that says Support Home. At the bottom of that page is an AspireOne Support link. Click that and finally, a knowledge base page comes up that you can actually perform a search on (they sure know how to make it easy, don't they?)
There is a link there to download an updated version of the eRecovery software. Good luck. I just gave up and installed Windows 7 relying on the hidden partition in the event I have to revert back.