I burned 1 GB of info in a DVD-R disc. Computer could read it perfectly and said 1 GB was recorded and 3 GB still free available for more data. Next day I tried to add more data, 0.5 GB in a folder. All was OK, I dragged folder to DVD and PC said it was doing the job, after 2 minutes said folder was ready to be burnt. But the previous folders did not appear. I quit burning and tried to check the information on DVD. right- clicked properties and PC says it has 1 GB of data burnt and 3 GB available. But if I try to read the information I had burnt before, nothing, no files or folders. May I still recover the 1.0 GB recorded first day? HOw?