[MacTUG] diskutil resetFusion

[Keith Peck]

Hi Don,
Not sure if you found a solution or not?

I had an issue that I did not make detailed notes for after fixing it, but it was a Fusion drive that no longer appeared as a boot device after it got wiped and the Windows 10 / Bootcamp partition hadn’t been safely cleaned up. Leaving the 27”-iMac about as useful as a paper weight.

I didn’t see any complaints about needing SSD and rotational, so you might have encountered a different problem than me

I used a USB with the Mac OSX installer while holding the Option key to boot.

Disk Utility wouldn’t allow changes as it could not mount the disk or any of its volumes, but I could open a command window and type in diskutil commands to erase the disk and erase logical volumes until I was left with only a single partition.

Something like…
Diskutil eraseDisk HFS+ Empty

eraseVolume /dev/disk0s1

eraseVolume /dev/disk0s2

eraseVolume /dev/disk0s3

Leaving a single partition/volume = disk0

Reformatting then worked with Disk Utility from the USB which then allowed the OS to be installed.

Although I may have done the eraseVolume commands before the eraseDisk command – my note paper has a bunch of things written on it, but unfortunately not in the order that I tried them.

And my note paper doesn’t have the command used to obtain the list of volumes written down on it. I just hope this might give you some ideas on how to get the Fusion drive working once again.

Keith

From: <mactug-bounces at lists.uwaterloo.ca> on behalf of Dani Roloson <daroloso at uwaterloo.ca>
Date: Wednesday, August 28, 2019 at 6:45 PM
To: MacTUG <mactug at mailman.uwaterloo.ca>
Subject: [MacTUG] diskutil resetFusion


Anyone with experience?

Keeps complaining need SSD and rotational.

Nothing says whether they're supposed to be unmounted, named the same, or what state.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.uwaterloo.ca/pipermail/mactug/attachments/20190910/0ee0072c/attachment.html>