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Study Guide: CompTIA A+ Core Certification: Comparisons of Common RAID Levels
Source: https://www.fatskills.com/comptia-a-exam/chapter/comptia-a-core-certification-comparisons-of-common-raid-levels

CompTIA A+ Core Certification: Comparisons of Common RAID Levels

By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.

⏱️ ~1 min read
RAID Level Minimum Number of Drives Required Data Protection Features Total Capacity of Array Major Benefit over Single Drive Notes
0 2 None Twice the capacity of either drive (if same size) OR twice the capacity of the smaller drive Improved read/write performance Also called striping
1 2 Changes to the contents of one drive are immediately performed on the other drive. Capacity of one drive (if they are same size) OR the capacity of smaller drive Automatic backup; faster read performance Also called mirroring
5 3 Parity information is saved across all drives. Capacity of smallest drive (where x equals the number of drives in the array) Full data redundancy in all drives; hot swap of the damaged drive supported in most implementations  
10 4 Changes on one two-drive array are immediately performed on the other two-drive array. Capacity of the smallest drive × the number of drives ÷ 2 Improved read/write performance and automatic backup Also called striped and mirrored

 

 


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