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Disk array controller
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<p>A disk array controller is a device that manages the physical <a href="/facts/Disk_drives/uCvJ6nrq">disk drives</a> and presents them to the computer as <a href="/facts/Logical_Unit_Number/6FkUxbw6">logical units</a>. It often implements <a href="/facts/RAID/IpzWWgog">hardware RAID</a>, thus it is sometimes referred to as RAID controller. It also often provides additional disk <a href="/facts/Cache_(computing)/gmJYN8wm">cache</a>. </p><p><i>Disk array controller</i> is often ambiguously shortened to <i><a href="/facts/Disk_controller/dfRSYlMq">disk controller</a></i> which can also refer to the circuitry responsible for managing internal disk drive operations. </p>