Hi All I use the libata patch from http://home-tj.org/wiki/index.php/Libata-tj-stable with my supermicro MB ( ICH7R chip). The AHCI works as desired in most of the time. If I have disk(s) plugged in during boot. Then after boot, I kept unplug and plug many times and it works fine. but i noticed that if I have the disk(s) unplugged during boot, then after boot, I plug the disk and nothing shows. if I try to do rescan by run the rescan lun script, i saw these from dmesg. Anything clue ? Thanks! Ming --------------------------------------- ata4: soft resetting port ata4: SATA link down (SStatus 0 SControl 0) ata4: EH complete ata3: soft resetting port ata3: SATA link down (SStatus 0 SControl 0) ata3: EH complete ata4: soft resetting port ata4: SATA link down (SStatus 0 SControl 0) ata4: EH complete ata3: soft resetting port ata3: SATA link down (SStatus 0 SControl 0) ata3: EH complete ata4: soft resetting port ata4: SATA link down (SStatus 0 SControl 0) ata4: EH complete - : 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