what writer do u have
i have an NEC2500A and I get and recommend
Datawrite Classic Yellow 4.7gb
http://www.burn-media.co.uk/acatalog/DVD_R.html
Datawrite Yellow Princo 4x - 25 Tub Ref: DVDR007
they are £8.45 for 25
i can testify had no coasters or compatibility problems with my dvd players or ps2.
i did try the datawrite red ones which were slightly cheaper and these didnt work full stop with my writer.
Princo are known to be a cheap disc supplier but these ones work absolutely fine for me. ive ordered over 200 im so confident in them