The RAID (Redundant Array of Independent Disks) technology allows you to use several physical disks (whether hard disks and/or SSDs) as if they were a single physical disk.
In the case of a hardware or pseudo-hardware RAID, the operating system will therefore see a single disk (the RAID volume created via the RAID controller used) instead of the various physical disks that compose it.
This allows you to benefit from a fault tolerance (with RAID 1, for example), better performance (with RAID 0, for example) or to combine fault tolerance and performance with RAID 5 (or a higher RAID level, depending on what is supported by your RAID controller).
This RAID technology exists in 3 versions :
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