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<title>RAID level-1 (glossary)</title>

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<h2>RAID level-1</h2>
<p>A RAID level that uses data mirroring to distribute data across two physical
  drives. It provides data redundancy and performance acceleration, although the
  usable physical drive space is reduced by 50 percent. </p>

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<p align="right">x-0554-HSM-00-00-EN </p>

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