High Quality Dvd-rw Mysterious Disappearance Of Available Space On A DVD+RW?

Mysterious disappearance of available space on a DVD+RW? - high quality dvd-rw

I have my parents' DVD recorder last time I was home, and everything went well until a few days earlier. They say that when they put a DVD + RW, as it has eliminated all the programs that are much less space than before.

The highest quality, XP, because 4 hours of recording time setting, now say it is less than 2, with nothing on the disk.

This is a standard DVD recorder without a hard drive. Each of these discs from Sony, so it should not be a question of quality. I'm in the same province, and anyone with parents who have just entered, which means the technology that it be difficult to assess the situation get through Skype, if I talk to them.

Layman terms like if you donone had a lot of technical names, with the same ending ..."- thing "

If anyone has an idea what could be the problem here? The DVD burner is only 3 months.

Thanks