its not so much the discs that cause the problem but the dye they use, ive had problems in the past with verbatim discs not working. these discs use their own dye called "Metal Azo"

best discs ive found use "g04" dye, normally Ritek discs
you can now get "g05" dye discs that can record at 8x speed

try http://www.rambox.co.uk/rambox.php?f...&category_id=1

couldnt find your model dvd, have a look here http://sony.storagesupport.com/dvdrw/index.htmand see if your firmware needs updating as this can help the performance of your dvd