Seagates IronWolf Pro lineup of hard drives for network-attached storage units has consistently offered good value for money, particularly at the highest capacity points. I purchased two 22TB IronWolf Pro drives for production deployment late last year. As part of the burn-in testing prior to actual deployment, they were put through our evaluation routine for direct-attached storage drives in both internal and external (Thunderbolt 3 DAS) modes. Read on for a look at the performance you can expect from the drive in standalone, RAID 0, and RAID 1 modes.