If you want to keep the Marvell controller in use, then I found them a lot more stable with Tagged Command Queueing disabled: echo 1 > /sys/block/sdX/device/queue_depth Otherwise you might also look for a firmware update for the WD Green drives which you are having problems with (they might be hidden on vendor support sites like those of Dell and Lenovo, if you can find particular PC models which shipped with the same models of WD drives that you have). Also if possible, consider switching for the ASMedia controllers if possible - the two port versions are available for under €10. Tim.
