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My Mac Pro RAID Card is configured with a four-drive RAID 5 set and the available disk space is less than I expect. Why?

April 26, 2017card configured disk mac pro raid

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My Mac Pro RAID Card is configured with a four-drive RAID 5 set and the available disk space is less than I expect. Why?

1 Answer

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This is normal and expected behavior. Due to the way data is placed on a four-drive RAID 5 set, the total effective capacity is reduced. See this Mac Pro RAID Card: Capacity for four-drive RAID 5 configurations may be different than expected for more information.