Mohtaram Assalam Alaikum

I am using Microsoft XP SP2 with Nero 7 .For quite a few days my removable device (G) shows CD Drive while earlier it was showing DVD…..(something I can't remember).Now when I am copying DATA or DVD Video files, after the massage "Burn process started" it shows the following massages.

1. Power calibration error G: SONY DVD RW RA –****A.

2. Writing short lead out.

3. Command sequence error G: SONY DVD RW RA –****A.

4. Could not perform end of Disc at once.

5. Burn process failed at 16x (22,160KB/s).

While in making Data CD it is ok except some of the files fails to open later.

Please help.

Thanks.