Your IT department has access to Network Attached Storage (NAS). You learn that files are accessed from storage technology that combines multiple disk drives into a single logical unit to increase logical volume size, improve performance, or reliability. This combination of individual disk drives to make a single logical unit is know as a:
Small Computer System Interface (SCSI)
Single Large Expensive Disk (SLED)
Redundant Array of Independent Disks (RAID)
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Answer Description
Redundant array of independent disks (RAID) storage uses multiple disks to provide fault tolerance and/or to increase storage capacity in a system.
RAID configurations are common when utilizing NAS systems
Wikipedia
RAID (; "redundant array of inexpensive disks" or "redundant array of independent disks") is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both. This is in contrast to the previous concept of highly reliable mainframe disk drives referred to as "single large expensive disk" (SLED).Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the required level of redundancy and performance. The different schemes, or data distribution layouts, are named by the word "RAID" followed by a number, for example RAID 0 or RAID 1. Each scheme, or RAID level, provides a different balance among the key goals: reliability, availability, performance, and capacity. RAID levels greater than RAID 0 provide protection against unrecoverable sector read errors, as well as against failures of whole physical drives.
RAID - Wikipedia, the free encyclopedia 
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