Fujifilm (old very small batch -> prodisc !)
FUJIFILM the media that currently is sold is ricohjpnD00.(made by ritek)
Samsung are RITEK double layers.
Ricoh is ricohjpnD00. (made by ritek)
Philips latest batches are PHILIPS CD2. (made by CMC)
Older Philips batches are MKM (made by MCC/MKM (singapore) /CMC(taiwan) )
Maxell is MKM.
for everthing still counts.
MKM -best quality and support
RICOH - good quality - but support is still behind the mkm stuff
Philips - ok quality but support is not that good but companies are working on it.
Ritek - large fluctuations in quality and support is good but thanks to variations not a real option.
I would reccomend the MKM stuff or else Ricoh if your drive supports them.