Hi! Thx for answering. I don't know if it was a Poltergeist or something like this , but i have just tried the same disc and here are the results:
LTR 52327S->> FES by hardware (software not supported):
Slow, but acceptable.
Toshi SD-M1502->> FES by hardware (software not supported):
Its normal speed. Fast, faster than the Lite-on.
Uffff, all returns to its place. (by now:cool: ...)