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When a member of a RAID 5 volume fails, the operating system directs the reading and writing all of new data to the remaining members of the volume. A single member failure will not result in data loss, but reduces overall performance of a RAID 5 volume. Repairing a RAID 5 volume restores its performance by reconstructing the data of the failed member on another disk.

Here is a screenshot of a failed RAID 5 volume in Acronis Disk Director 11 Advanced Server and in Windows Disk Management: