A controller card that supports one or more RAID configurations. Originally only for SCSI drives, RAID controllers became very popular for PATA, SATA and NvMe drives. See RAID. THIS DEFINITION IS ...

And that's before factoring in the price of SAS adapters if your RAID controller doesn’t have SATA ports (or vice-versa) for your server HDDs. Meanwhile, software RAID can be set up for free on ...