Drum,
thanks for the information. today i am luncky that I went back to the retailer (it's a few days over the 14 return period), told them wat happened, they agreed to change. best of all, seems it works from my incomplete test. reading and writing both tested once (forgot to say that the old one even refuse to write! unlike stubenkastl. So my impression now is that the old one is most probably a quality issue (it's still possible that some odd combination of softwares make that one unhappy, but i tested in two computers, both out of luck). so lite-on, if they read this, i hope this is warning to them.
good luck everybody.