>you could dd if=/dev/zero of=/dev/your/disk, Oddly enough, dd hangs as well. I guess that means it's not a RAID problem. Very strange though, and I don't have a good intuition about why it's happening. dd if=/dev/zero of=/dev/hde dd if=/dev/zero of=/dev/hdg dd if=/dev/zero of=/dev/hdi dd if=/dev/zero of=/dev/hdk All of the above hang the system after a few seconds. I'm sorry is this is now off-topic, but maybe some of you experts have some intuition about why this might happen? All four of the drives can't have "gone bad" or something. -Arnab - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html