if your burning at 4x......it's not a burn speed issue on that tdk48x
as for the tdk media......the label has nothing to do with who made the media. TDK Maxell Sony...and the rest outsource to a handful of media producers....come of which are crap, some pretty stable.
TY media is usually considered "premium media" for recording. If you use the search button up top, you can find tons of threads discussing what is good vs crap media...howto tell what media you "really" have...etc.
I'd have to agree, based on what your reporting, with Johnboywalton, crap media..
Get your hands on some TY media and give it a try....let us know how you do..:iagree: