Ours was Western Digital. I worked at a VAR before the turn of the century and there was a rumored clean room problem at WD. We had over a hundred drives that failed but they flat refused to acknowledge the problem.

Ended up having to kill the drives on a dedicated rig and send them back to keep our customers from having issues. They knew they were bad but refused to accept them back prior to failure. For a while they were returning a failing drive on the RMA too.