DVD writing Problem(last part of DVD not readable)

[User Name]

I burnt Two DVDs.
At start they play properly but the last part of both DVDs can't be played. I burnt one dvd with raxio and one with nero 8 lite. Both says burning completed successfully. I found last sectors are not readable.
I never had this prob. before on my DVD writer.
Is the DVD writer has problem or DVDs are not good?
Have any one got this problem before?

[User Name]