Comment 15 for bug 175022

Hi Claus,
Please be advised that the 'hdparm' command doesn't work with the newer kernels. (Any kernel where your device is /dev/scd rather than /dev/hd )
It seems that enough people try it that it is the right thing to do, but it isn't. There will be a few lines in the dmesg output that tell you what is going on, like in mysticism's post near the top of this thread.