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How much storage is utilized with RAID-5?

If I had a RAID-5 set up with five 100 GB drives, how much hard drive storage space would actually be utilized as data storage and how much would be used by parity information?
The overhead of RAID-5 is fixed at one drive. With an array of five 100 GB drives, you lose 100 GB.
This was last published in March 2003

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