Problems Problems Problems.

I went out and recorded all the footage i needed, took the camera home and put the DVD in my computer. The DVD was showing as blank, I then put it back in the camera and it said it wanted to format it, not wanting to lose my hard work i went to the shop asking them if the camera was faulty they told it was because i was using DVD- discs and they will lose all data if not finalised. I then bought some DVD+ discs and had to record everything again. Not happy.