tnx for your input; apart from the detailed discussion the topic may be summarised like this: - better buy WD red drives next time (will do!) - other manufacturers drives fail too, not only a WD issue - drives from one (bad) batch are more likely to fail current status: the raid5 assembled of just 3 WD 3TB green drives works fine so far, even under load. no bad sectors so far (knocking on wood). will extend it to 4 drives as soon as the replacement drive arrives. the drives are installed in the same chassis and bays as all the previous drives, therefore it is unlikely that the failures were caused by overheating/vibrations etc. never had any (serious) problems with 750GB and 1.5TB WD green drives before. tnx & cu -- 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