Mac os x lion raid disk utility

Nov 24, RAID 1, also known as a mirror or mirroring, is one of the many RAID levels supported by OS X and Disk Utility.
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How to deconstruct a software RAID made with macOS Sierra’s Disk Utility | Macworld

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  2. How to deconstruct a software RAID made with macOS Sierra’s Disk Utility.
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  5. Use Disk Utility to Create a RAID 0 (Striped) Array.
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Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. Updated November 24, OS X While these instructions should work for both past and future versions of OS X, some of the steps, nomenclature, or images shown in this article may be different. Disk Utility , which is included with OS X.


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Two or more hard drives. The process of creating RAID 1 mirrored sets erases all the data on the hard drives. Using hard drives that are the same make and model is recommended, but this is not a requirement.

RAID 1 is one of the many RAID levels supported by OS X and Disk Utility

One or more drive enclosures. Mac Pro users may have internal drive bays available. Everyone else needs one or more external drive enclosures. Make sure the hard drives you intend to use are connected to your Mac and powered up. Select one of the hard drives you are going to use in your RAID 1 mirror set from the list on the left.

Use Disk Utility to Create a RAID 0 (Striped) Array

Click the Erase tab. Enter a name for the volume. Click Security Options. Click Erase. Repeat steps 3 through 9 for each additional hard drive that is going to be part of the RAID 1 mirror set.

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Give each hard drive a unique name. Here's how: Launch Disk Utility if the application is not already open.

Use First Aid to verify and if necessary repair an ailing drive. To use it, click the First Aid button on the left side of the Disk Utility window. You get information about any problems that the software finds.


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  • If verification turns up trouble, click Repair to have the problem fixed. You can also use First Aid to fix disk-permission problems. When you format a disk, you erase all information on it permanently.

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    If the data is critical, you should have at least two or even three known-to-be-valid backup copies of that disk before you reformat.