RAID controllers manage the interaction between the computer and a redundant array of independent disks (RAID), a series of hard drives containing shared or duplicate data. They convert the storage units in the hard drives into logical units, so that the computer sees them as a single drive. They are usually part of the RAID system and are seldom sold separately.
Disk channels: Choose a RAID controller with an SCSI or serial ATA (SATA) channel for faster processing and performance. For applications that need high bandwidth, consider a fiber channel controller, which will work with SCSI channels as well. Array capacity: Choose a RAID controller that can handle large amounts of array storage. Dedicated external controllers usually have the best capacity and can manage up to terabyte units, although the capacities of regular external controllers are sufficient for most systems.
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