the final, the IronWolf SSD and HDD drives, Blend equally systems in one drive that then has its have firmware logic to distribute information for optimum performance further than what SSD delivers on its own.
It's https://darrennkbr781359.ltfblog.com/28506947/storage-nas-dubai-storage-nas-network-attached-storage-buy-qnap-synology-nas-storage-devices-things-to-know-before-you-buy