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TOPIC: Recovering data from accidental Fusion drive

Recovering data from accidental Fusion drive 04 Nov 2019 03:52 #11498

I accidentally included a disk in a Fusion drive that I didn't intend to when creating a roll-your-own Fusion drive. I typed "diskutil cs create Fusion\ Drive disk1 disk2" instead of "diskutil cs create Fusion\ Drive disk0 disk1" and so lost a disk with valuable data on it. I did *not* complete creating the Fusion drive by executing 'diskutil cs createVolume logicalvolumegroup jhfs+ Macintosh\ HD 100%'.

No, there's no backup; this was an old Snow Leopard drive that I was keeping intact until I got around to going through it.

I don't necessarily expect anyone here to know how to un-Fusion it, though advice would be appreciated; best I can tell from looking at 'man diskutil' is that I need to execute 'diskutil cs deleteVolume' on disk 1, then 'diskutil cs revert' on disk2. That should get me a reformatted disk (the 'create' command wipes the disk, and then the revert command (presuming that works) changes it back to its initial format.

I'm pretty sure the data has not been zeroed out; certainly the operation didn't have time to do so.

So presuming all this works and I can get a 'blank" disk back, what is the best way to recover the data? My hope is that only the 'header' info will have been changed; is there a hope that I can get my disk back intact, or will I have to scramble around looking for individual files? It's been many years since I've tried anything like this, and I want to make sure I do it right.

TTP 10 running on El Capitan, if it matters.
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Recovering data from accidental Fusion drive 04 Nov 2019 04:17 #11500

I do not have any experience with using diskutil to create a Fusion drive. If you like, you can write to This email address is being protected from spambots. You need JavaScript enabled to view it. to see if there are any suggestions. You might also try the Apple Support Forums.
MicroMat Inc
Makers of TechTool
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Recovering data from accidental Fusion drive 04 Nov 2019 15:23 #11501

>I do not have any experience with using diskutil to create a Fusion drive.

Right; I assumed that, which is why my actual question was

"So presuming all this works and I can get a 'blank" disk back, what is the best way to recover the data? My hope is that only the 'header' info will have been changed; is there a hope that I can get my disk back intact, or will I have to scramble around looking for individual files? It's been many years since I've tried anything like this, and I want to make sure I do it right."
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Recovering data from accidental Fusion drive 04 Nov 2019 16:07 #11502

I do not know, and can only suggest that you write to This email address is being protected from spambots. You need JavaScript enabled to view it. .
MicroMat Inc
Makers of TechTool
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