Right recently there is few posting regarding having problems burning a DVD esp. A series vaio laptop. So i did some test myself to check if i also having the same problems.
My vaio is A317S and the optical drive is
Double layer DVD±RW Drive, DVD RW DW-D56A, Driver Ver 5.1.2535.0
Using Memorex DVD-R 4.7G (120min)
Right, i used Click DVD to convert,
6X .avi movie file, 4mbps (120min) to DVD file.(the higher the mbps the shorter the running time but higher quality.)
It took me about 1-2 hours to convert all the file,
The processor is running at 92-95% and temp. 65C (normal temp. 40C)
After converting the file is 5G and about 128min+ so i had to cut short the movie abit using the Edit movie function to 4.6G about 110min.
Right the moment of truth, using the Memorex DVD-R (4.7G 120min) i click start burn DVD and within 30min its finished burning with no problems at all.
I test it on my vaio and its recognize as DVD movie and i also test it on mu DVD player also no problems at all.
Sum.
I had no problems using a DVD-R disk to burn/copy file into it using my optical drive (A series). 
Excellent
Yeah that means A series shouldnt had any trouble burning using DVD-R
Yep, sounds good.
A Sony DVD in a Vaio Notebook shouldn't make troubles ..... but GRT with Pioneer is another story. 
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