Many businesses have drawers full of old 500GB or 1TB hard drives that seem too small to be useful on their own. RAID can turn that drawer into a single, faster, and more reliable storage unit, avoiding the need to buy new hardware. As the guide notes, speeds won't match an SSD, but they are much faster than a conventional HDD, and the main benefit is convenience and reliability rather than raw performance.
The choice of RAID level changes the outcome significantly. RAID 0 stripes data across drives for speed and full capacity, but if one drive fails, everything is lost. RAID 1 mirrors the same data to every disk, using 50 percent of total capacity for redundancy. RAID 5 and RAID 10 offer more complex trade-offs, requiring at least three drives or paired mirrors, and can reconstruct data after a single drive failure.
Implementation can be software-based using built-in OS tools like Apple's Disk Utility or Windows Disk Management, or through paid utilities such as StableBit DrivePool and SnapRAID. Hardware-based setups with dedicated RAID controllers or enclosures deliver better performance and protection, but are more complicated and may require additional purchases. The guide advises checking maximum capacities and speeds before buying an enclosure, since high speeds are not guaranteed across all models.