thank you so very much dude.

at least you provide me with a reasonable answer...after i set DMA to Mode 2 ...upgrated fw to BSLB...replaced 40pin IDE to 80pin...and updated nero OEM to latest version...why i can burn MCC004 at 12*...

well, MCC003 really impressed me and i naturally moved on to MCC004 but MCC004 shocked me...

thank you again