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________ is a technology in which extra copies of data are stored on two or more hard drives to ensure that critical data is not lost.
JBOD
RAID
SLED
BIOS
The correct answer is: RAID
RAID stands for Redundant Array of Independent Disks, which is a technology designed to enhance data storage reliability and performance. It involves combining multiple hard drives into a single unit to protect against data loss. In a RAID configuration, data is duplicated across multiple drives (redundancy), which means that if one hard drive fails, the data can still be recovered from another functioning drive. This redundancy is essential for critical data storage as it minimizes the risk of data loss due to hardware failure. In contrast, other options do not provide the same level of data protection. JBOD (Just a Bunch Of Disks) refers to a storage architecture that combines multiple drives without redundancy. SLED (Single Large Expensive Disk) is a term used to describe large-capacity single drives that do not inherently offer redundancy. BIOS (Basic Input/Output System) is firmware that initializes hardware during the booting process and has no direct role in data redundancy or storage solutions. Thus, RAID is the appropriate answer for ensuring critical data is not lost through its redundancy capabilities.