Sony DVD+R is blank after successful burn


I have a DELL notebook and have faced a problem while trying to burn a DVD+R. I used NERO 7 to make a data DVD and it successfully burnt the data. But when I try to browse the contents of the DVD through Windows Explorer it appears to be blank. This problem does not occur while burning a CD-R or a DVD+RW. I have also tried other writing softwares like SONIC (default one provided by DELL) but the same problem occurs. It is neither a problem with the DVD’s as I have written other DVD+R’s from the same pack using NERO 7 on the same model of DELL on other notebooks. Is this a problem with the dvd drive on my notebook??

Pls. help!

Try again, this time ENABLE VERIFY.

Or check the disc using nero cd dvd speed.