Hi, I have fixed several 7200.11 ST3500320AS SD15 500GB drives since the busy problem happeded and the solution was posted in this forum. All drives worked fine after fixing and I recovered all data correctly (I'm talking about 6-8 drives I'm not sure). But recently I have experienced a strange behaviour with two drives: I follow EXACTLY the same steps as usual and apparently the problem is solved but when I connect the drive to the computer the drive isn't still recognized. During fixing steps I got correct feedback from drive on hyperterminal according to the tutorials, (I got no errors or strange messages), but no matter how many times I repeat the process the drive remains busy. Or at least not recognized in BIOS. I assume that serial adapter is working fine because I got response from drive on hyperterminal, in fact I recovered one drive after the first one that failed in fixing it. Does anyone have the same problem? Thank you all and excuse my spelling mistakes so I'm not english-speaking.