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Take Control of Mac OS X Backups, Fourth Edition by Joe Kissell

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Raids

RAID stands for Redundant Array of Independent (or Inexpensive) Disks; it's a way of combining several physical hard drives into a single logical volume using either software or a special hardware controller. Of the numerous ways to configure a RAID, two [1] are particularly relevant to the discussion of backups:

  • Striped: A striped RAID (RAID 0) alternates between two or more disks when writing segments of data. (So, the capacity of the RAID is equal to the total capacity of the member disks.) Striped RAIDs let you combine multiple disks into larger volumes with faster performance (since all disks can be accessed in parallel), but if an error occurs on any disk, the entire RAID will fail.

  • Mirrored: A mirrored RAID (or RAID 1) writes the same ...

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