[QUOTE=yenclas;2692061]I buyed 10 BD-R DL 50Gb Verbatim MEIT 02 (001) 4x in ebay and burned with my Pioneer 207ebk at 2x without problems but at 4x ImgBurn shows error at begin.( :([/QUOTE]
IÂ´m not sure if burning speed is the problem here.
It might be one bad disc, or power supply or a connectivity problem.
Did you burn contents from an external USB connected hard disc or was an USB connection involved at all?