dusty@xxxxxx wrote: > I could solve the problem by ncq blacklisting the "Maxtor 6V300F0" devices > in libata-core.c That's a strange story. The reported error was PHY readiness changed and Device exchanged, both of which point to hotplug event. Maybe something causes the firmware to reset? What happen if you only leave two drives on the port multiplier and remove the NCQ blacklist? Also, does the error ever occur on the drives which are connected directly to the controller? -- tejun - 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