My Mac Mini w/ Fusion Drive (that’s a hard disk and an SSD pretending to be a single volume for better performance) froze and wouldn’t boot. Nothing would make it boot normally again. Recovery mode was OK but couldn’t erase the boot volume nor mount it via Disk Utility (I just got “Unable to delete the core storage logical volume”), so reinstalling seemed impossible.
Slots of vegas free coins. In Disk Utility, select “Macintosh HD” (or the name of the disk to erase and clean install Catalina onto), then click the “Erase” button Choose “Macintosh HD” as the name, then go to “Format” and select APFS, then choose “Erase” – WARNING: THIS ERASES ALL DATA ON THE MAC. The Disk Utility on macOS is a useful tool for fixing any disk-related issues or performing tasks that involve the hard drive. But this tool is not impregnable. Flaws, such as the “Couldn’t Unmount Disk” error, can happen from time to time. When this happens, simply follow the.
Fortunately, I figured out how to do it, using some help from a StackExchange post I found. See below for the details.
Go bananas reviews. The magic incantation that fixed it was inspired by instructions I found here:
http://apple.stackexchange.com/questions/136590/how-can-i-delete-a-partition-corestorage-logical-volume-from-the-terminal
http://apple.stackexchange.com/questions/136590/how-can-i-delete-a-partition-corestorage-logical-volume-from-the-terminal
Note: THIS WILL WIPE YOUR HARD DISK. Only do this if you’re completely ready to just burn it all down to the ground and start over with a blank boot disk.
Here are the steps:
- Boot the recovery volume, which will take you to an OS X Utilities page that shows four options: “Restore From Time Machine Backup”, “Reinstall OS X”, “Get Help Online”, and “Disk Utility”. If you have gotten to this article you have probably already been into Disk Utility a few times already without success, so don’t open Disk Utility.
- From the Utilities menu of the “OS X Utilities” app, open Terminal. (Maximize the terminal window that opens so it’s easier to see the output of the next step.)
- Run diskutil cs list . Using the mouse, copy the long alphanumeric string that’s on the third line of output after “Logical Volume Group”. That’s the Logical Volume Group’s universally unique identifier, a.k.a. its “lvgUUID”.
- LAST WARNING: FROM HERE ON OUT THIS DELETES ALL OF THE DATA ON THE HFS+ LOGICAL VOLUME (but it doesn’t delete the recovery partition).
Run diskutil cs delete FOO-BAR-BIZ-BAZ, where FOO-BAR-BIZ-BAZ was your lvgUUID. This deletes the logical volume group. diskutil will print things about erasing the physical partitions that made up the logical volumes, which in my case were /dev/disk0s2 (a 931GB partition on the internal hard disk) and /dev/disk1s2 (a 113GB partition on the internal SSD). Pay attention to the names of the devices that it just liberated on your system, since you’ll use those device names in the next step.
At this point you have two empty HFS+ partitions that are not a Fusion drive anymore, so you’ll want to rebuild the LVG from those two physical partitions. - Run this: diskutil cs create'Macintosh HD'/dev/disk0s2/dev/disk1s2 and adjust the /dev/. stuff to include the partitions that diskutil said it erased & mounted in the prior step.
On my Mac Mini it took about a minute to finish.
At this point if you run diskutil cs list you should see just a Logical Volume Group and as many Physical Volumes as you added (which is two in my case, disk0s2 and disk1s2), without any Logical Volumes yet. - Quit Terminal.app and run Disk Utility from the main “OS X Utilities” app.
Disk Utility should show “Fusion Drive” without any partitions in it, which is expected since we just created the Logical Volume Group without any Logical Volumes in it. - Select the Fusion Drive and run First Aid on it.
First Aid will immediately create a Logical Volume and format it, leaving one big partition of type”OS X Extended (Journaled)” named “Untitled”.
Now you’re free to do whatever you want with this empty disk. In my case, I erased it and created a new partition named “Untitled” of type “OS X Extended (Journaled, Encrypted)” since I want full-disk encryption.
(I tried to call it “Macintosh HD” during the erase step, but Disk Utility failed to erase the disk and complained that name was invalid, so I just left it as “Untitled”, erased the disk, and then renamed it by selecting the Untitled volume in the left-hand-side list of devices, then clicking on the right-hand-side pane where the name Untitled was shown and editing it there.)
After this, I quit out of Disk Utility, and ran the “Reinstall Install OS X” app. That does a network install which first required me to log in with my Apple ID and then downloaded the install files.
Subscribe to this site's feed ››
Add to Google Toolbar ››
Submit News ››
Add to Google Toolbar ››
Submit News ››
Help, Guides, and News on making the Switch To Apple Macintosh Computers
https://indly.over-blog.com/2021/02/the-pdf-reader.html. Featured Guides
Macintosh Guides
How to Switch
![Disk Disk](https://recoverit.wondershare.com/images/article/2019/08/format-new-disk-2.jpg)
How to Switch
Macintosh Hd Update
What is Disk Utility?
- guides
As its name implies, Disk Utility is a Mac OS X Utility that helps Mac users work with disks. The types of disks that Disk Utility can manage include hard disks, disk images, DVDs, and CDs.
What can I do with Disk Utility?The version and features of Disk Utility depend on the version of Mac OS X. The following image demonstrates Disk Utility in Mac OS X Snow Leopard. Note that some items are grayed out because they are not applicable to the 'disk' I have highlighted in the left pane of the Disk Utility Window.
The left pane shows the 'disks' currently connected to your Mac. At a minimum, you'll see the hard drive that has the 'Macintosh HD' partition. If you have additional internal hard drives or external hard drives connected to your Mac, they too will be visible. If your Mac has an optical drive, you will see it as well. The image below shows only an internal hard drive and optical drive.
What are some important feature of Disk Utility?
- First Aid - to repair file systems and file permissions
- Erase - erases all the data on a disk or volume
- RAID - allows you to stripe or mirror disks in a RAID
- Restore - allows you to copy or restore a disk image to a disk
By: switchtoamac
Recent Guides
- What is Lion?
What is Disk Utility?
What is Boot Camp Assistant?
What is Snow Leopard?
What is Airport Utility?
What is Activity Monitor?
Quickly navigate to the Utilities folder
What are Utilities?
Forward delete on a Mac keyboard
Show or Hide Sidebar items via Preferences
Determine which updates have been installed by Software Update
Disable automatic updates in Software Update
Manually run Software Update on Mac OS X Leopard
Different ways to launch a Mac OS X Application
Expose for Apple keyboards that have volume controls on F9, F10, and F11
What is MobileMe Gallery?
What is iWeb?
Visit the Guides List
Recently Updated
Macintosh Hd Data Vs Macintosh Hd
- What is Lion?
- What is Mac OS X?
- MacBook Pro
- MacBook Air
- MacBook
- Choose Your Mac
- The Mac Models
- What are Utilities?
- What is Disk Utility?
- What is Boot Camp Assistant?
- What is Snow Leopard?
- What is Airport Utility?
- What is Activity Monitor?
- Quickly navigate to the Utilities folder
- Expose for Apple keyboards that have volume controls on F9, F10, and F11
- Forward delete on a Mac keyboard
- Show or Hide Sidebar items via Preferences
- Customize the Sidebar - Hide and Show
- Finder and Sidebar - an Ideal Combination
Recent Articles
No Macintosh Hd On Disk Utility Disk
Apple to offer free OS X Lion upgrade for new Macs via the Mac OS X Lion Up-To-Date program
Forbes: Apple Gets Predatory With Lion OS Pricing
Town of Wellesley Massachusetts - 'Macs Apple of their eye'
WWDC 2011 - Apple's SVP of Product Marketing Phil Schiller, discusses the State of the Mac
WWDC 2011 begins today - Mac OS X Lion, iOS 5 and iCloud unveiling sets the stage for a Unified Apple Platform
Apple CEO Steve Jobs to introduce Apple's next generation software Mac OS X Lion, iOS 5, and iCloud during WWDC Keynote Address on Monday, June 6
Amazon launches a Mac Download Store - software and games for your Mac
AllThingsD - The Mac is kicking ass
Where in the world are Mac sales growing? Everywhere.
Corporate Mac sales surge 66 percent as Apple makes significant enterprise headway
Parallels Transporter an app that makes it easier to switch from a Windows PC to a Mac
RSS Feed · Guides RSS Feed · About · Shop · Privacy Policy · Terms of Use · Best viewed in Safari, Firefox, and Internet Explorer 7 or higher
Copyright © 2011 Switch To A Mac · All rights reserved. · All trademarks and copyrights remain the property of their respective owners.
Copyright © 2011 Switch To A Mac · All rights reserved. · All trademarks and copyrights remain the property of their respective owners.