Please, check http://bugzilla.kernel.org/show_bug.cgi?id=7674 Fedora 7 with current 2.6.21-1.3228.fc7 kernel has this bug. My hard drive clicks every shutdown in Fedora 7 and never had this with FC5 or Windows. This is serious bug. Please, help as soon as possible. Best regards, Serguei Miridonov. P.S. I could download the newer kernel 2.6.22 from kernel.org and compile it myself but I'm not sure if any additional patches were applied to 2.6.21 which is necessary for Fedora 7. P.P.S. I have read http://linux-ata.org/shutdown.html and I still can not understand your logic... What is needed just properly shutdown the system without any emergency heads unload... My understanding is that kernel has nothing to do with spin-up/spin-down disks. This is what shutdown or halt script have to do, unmounting filesystems, synchronizing cache with hdparm -f, and spin-down with hdparm -y if necessary. Then let the kernel just switch the power off. - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html