I can tell you that EMC and IBM both use the same drives from the same batch in an entire system of tens to hundreds of drives and while I don't know about all

I can tell you that EMC and IBM both use the same drives from the same batch in an entire system of tens to hundreds of drives and while I don't know about all cases completely I did oversee a large number of systems and drives and there was never a double disk failure we had that completely took two drives. With a proper background media scan procedure you also reduce the risk of a media problem in two different drives. Ofcourse, the SSDs we use are properly vetted for design issues and bugs in the firmware actually get fixed for us in a relatively timely manner. You get that level of service with the associated large volume.