Well, if it is different from a 7200.11: the 7200.11 "fix" will NOT likely work this thread which is for 7200.11 ONLY is not the right place to ask questions about a non-7200.11To this you add two a few changes from the "known" paths/methods, the use of MacOSX, the use of Minicom (whatever it is), an unspeciified USB/TTL adapter and clearly you are not using the Windows Terminal. Verify it is a 7200.11 with model ending in AS. If it is not one, start a new thread about your issue, after having checked for other existing threads (there is one about the 7200.12 and one about the ES.2 or NS version of the 7200.11) but YMMGV, there is a concrete risk that you might trying to apply either the "wrong" cure to the "right" disease or the "right" cure to the "wrong" disease. Double check with point #1 of the read-me-first: http://www.msfn.org/board/topic/143880-seagate-barracuda-720011-read-me-first/ jaclaz I understand the differences, the thing is that I have spent hours searching for a fix for my HD model, but apparently no one ever had this problem, so my last chance is to try the 7200.11 fix. If it doesn't work I'm throwing the disk out. Being it a Seagate, I think I can at least try the spin down command. My USB/TTL is working fine, Minicom is just a version of the Hyperterminal for Mac. At the moment I just need to find out which pin is which on the serial port of the HD. Just figured this was a better thread, even if for a different model, since the problem is related. Thanks for replying.