Hi Gang; probably a stupid question but I'm new to this. I own a Sony DRU 510A DVD drive; all info regarding it says it's a 4X writer. From the start I've been using DVD-R 4X media - Ritek mostly. I just checked Sony's sight for a firmware upgrade and titled in red ink there's a note: '4X dvd-rw media not compatible for recording w/your drive. please use compatible 1X or 2X dvd-rw media only'. Does that mean 4X dvd-r also ?? That's all I've used and if so, why are they saying that about a supposed 4X drive ? Also, could that contribute to the occassional freezing and audio glitches I've been getting in some of my copies? I don't know if this makes sense but I'm confused. Any suggestions thrown my way would be appreciated. Thanks - Steve.