Partition raid 1 drive mac

Disk Utility: Partitioning - How to Properly use Disk Utility on macOS

Any data written to a RAID 1 set is immediately copied to all members of the set; the same is true when you erase a file. As soon as you erase a file, that file is removed from all members of the RAID 1 set. As a result, RAID 1 does not allow you to recover older versions of data, such as the version of a file you edited last week. Using a RAID 1 mirror as part of your backup strategy ensures maximum uptime and reliability.

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You can use RAID 1 for your startup drive, a data drive, or your backup drive. 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. The hard drives you use as members of the RAID 1 mirror set must first be erased.

When you zero out data, you force the hard drive to check for bad data blocks during the erasure process and to mark any bad blocks as not to be used. This decreases the likelihood of losing data due to a failing block on the hard drive.

mounting RAID 1 drives? (Mac) | Tom's Hardware Forum

It also significantly increases the amount of time it takes to erase the drives from a few minutes to an hour or more per drive. Here's how:.

The total capacity of the RAID 1 mirror set you create is equal to the smallest member of the set, minus some overhead for the RAID boot files and data structure. As a result, you can use them as startup volumes, data volumes, or backup volumes. Drives added after a RAID array is created are known as hot spares. At that point, the RAID array automatically uses a hot spare as a replacement for the failed hard drive and automatically starts a rebuilding process to convert the hot spare to an active member of the array. When you add a hot spare, the hard drive must be equal to or larger than the smallest member of the RAID 1 mirror set.


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  • RAID 1 is one of the many RAID levels supported by OS X and Disk Utility!
  • Use Disk Utility to Create a RAID 1 (Mirror) Array;

When this occurs, the rebuilding process begins, assuming you selected the automatic rebuild option during the RAID 1 mirror set creation process. During the rebuilding process, the out-of-sync disk has data restored to it from the remaining members of the set.

mounting RAID 1 drives? (Mac)

The rebuilding process takes time. While you can continue to use your Mac normally during the rebuild, you should not sleep or shut down the Mac during the process. Rebuilding can occur for reasons beyond a hard drive failure.


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  7. Some common events that trigger a rebuild are an OS X crash, a power failure, or improperly turning off your Mac. Things to check for. You should check the box and see if this can be used for anything other than Raid 1.

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    Also there maybe software from WD on the drive that will change the Raid for you. If the WD is not hardware locked to be only a Raid 1 and you are unable to find WD software you can try the steps below. If you can not erase the WD with Disk Utility then try looking over instructions to erase it from the command line on this site. The hard drives you will be using as members of the RAID 0 striped set must first be erased. When you zero out data, you force the hard drive to check for bad data blocks during the erasure process, and mark any bad blocks as not to be used.

    This decreases the likelihood of losing data due to a failing block on the hard drive. It also significantly increases the amount of time it takes to erase the drives from a few minutes to an hour or more per drive. Make sure the hard drives you intend to use are connected to your Mac and powered up. Select one of the hard drives you will be using in your RAID 0 striped set from the list on the left.

    Repeat steps for each additional hard drive that will be part of the RAID 0 striped set.

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    Be sure to give each hard drive a unique name. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ask Question. I want a separate partition for time machine because it will continue to save backups until it runs out of space. I want to limit the backup partition to save room for my other files I want to store on the drive. Greg, did you ever find an answer? Not sure if this Post will get a reply anytime soon due to inactivity since March, thus will attempt to configure the drive via the WD Utilities and then partition using OS X Disk Utility.

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