Click the RAID tab along the top of the window. In this example, we will be creating a Raid from the two 149.1GB drives. Locate the drives that will be part of the array on the left side of the program. This is within the Applications folder, then the Utilities folder. It has slower performance than striped, but is slightly more stable. "Concatenated" is similar to striped, but writes data to only one disk at any time. It gives redundancy, allowing for a physical failure of one drive without data loss. "Mirrored" duplicates the data on each disk.Part of the data is written to each disk simultaneously "Striped" combines the disks into one large volume.This is called a RAID (Redundant Array of Inexpensive/Independent Disks). Disk Utility has the ability to combine the resources of several external devices.
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