- Erasing a Disk from the Command Line of Mac OS.
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There's no magical method to recover data from a failed striped array, which means you should have a very good backup system that you can use to restore data, should a failure of the RAID array occur. In this example, we're going to use two disks as slices of the RAID 0 array. Slices are just the nomenclature used to describe the individual volumes that make up the elements of any RAID array.
You could use more than two disks; adding more disks will increase performance as long as the interface between the drives and your Mac can support the additional speed. But our example is for a basic minimum setup of two slices to make up the array. Although not a strict requirement of RAID 0, it's a good idea for the drives to be identical, both in size and model. Remember, the process of creating the striped array will erase all data on the drives that will be used.
Creating a Fusion Drive Using Terminal
Make sure you have a current backup before you begin. It's possible to use a partition from a drive that has been divided into multiple volumes. But while it's possible, it's not recommended.
It's better to dedicate an entire drive to be a slice in your RAID array, and that's the approach we'll take in this guide. If the drives you're planning to use haven't yet been formatted as a single volume using OS X Extended Journaled as the file system, please use one of the following guides:.
The identifier will likely not be the same as the name you used when you formatted your drives. As an example, we formatted two drives, giving them the name Slice1 and Slice2. It's the identifier that we'll use on the next page to actually create the RAID 0 array. So far, we've gone over what you need to create a RAID 0 array using Terminal, and used the diskutil list command to get a list of the attached drives connected to your Mac. We then used that list to find the identifier names associated with the drives we intend to use in our striped RAID.
Restart to Internet Recovery Mode by pressing alt cmd R at startup. Booting to Recovery Mode is not conducive because the Recovery HD will be removed in one of the steps below.
And you can't remove a partition used as a boot volume. I recommend ethernet because it's more reliable.
If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting. Alternatively you may start from a bootable installer thumb drive preferably Yosemite or El Capitan or a thumb drive containing a full system preferably Yosemite or El Capitan. If you boot to a full system and login as admin you have to prepend sudo to execute special commands like gpt I had a related problem which I resolved by converting Core Storage. This may work for you, although it may not apply to your case. Home Questions Tags Users Unanswered.
How do I remove unused partition El Capitan? Ask Question. Asked 3 years, 10 months ago.
Finding The Disk Identifier
However, if you try to decrypt while logged in as a standard user, the diskutil tool will ask for admin authorization. If the needed admin authorization is not provided, diskutil will halt at that point and give an insufficient privileges error.
You can monitor decryption of the APFS volume from the command line by running the following command:. Boot from the decrypting drive. Open System Preferences 3.
Access hidden Disk Utility commands using Terminal in macOS | RAW Mac
I have the passcode. The Mac failed due to water damage. When I do a diskutil list I only see for that device. I am trying to determine if it is actually damaged, or if its not showing more info due to encryption. My decryption has paused unable to restart Mac to login-no password.
How do I recommence decryption from terminal via recovery option? Hello, my password is not being recognized even though I know for sure it is correct. Is there anything I can do or do I have to erase? How can I unlock using my account password? I have the UUID information for the disk but no encryption password.
How to Erase a Disk from Command Line in Mac OS X
Please let me know, thanks! Should I just wait or is there something else I need to do? Thank you your page has been very helpful. I have the same problem like Alex. How can i continue? You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account.