Retrieving lost files

stopmotion Said:

"Retrieving lost files: Problem solved! Continued to hunt for my missing files and it turns out I had cloned the contents of the partition before wiping it clean and re-dividing it so I do have all my data. A few months had elapsed between adding the extra partitions and trying to access the original data which I had transferred to an external drive. Should have documented at the time exactly what i did."

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Report this Fix to Apple Via Feedback:

Do your Part: Inform Apple of this fix. Apple barely reads these forums as it is on their own time. So, to get the word out to them, report it to them. Apple won't get back to you directly, but the more feedback they receive on this, the more they will know what is going on, and what needs to be fixed. Apple will know nothing of your findings, if you don't report them to them.

1. Go Here: Feedback - AirPods - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: on when you came across this issue, and the fix. Include the URL of this thread.
4. Proceed from there as necessary

stopmotion Said:

"Thanks for your suggestion. I didn't really consider backing up my files on the partition I wanted to re-divide as a fix for a bug however, but rather the safe and recommended way to proceed before dividing an existing partition into a few smaller ones w/o losing any data already stored (on the original partition). The only issue I had was that I had forgotten I had done that (and exactly where I had transferred the data). Thanks for the steps, though. Will retain that info."

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You are welcome.

Use of Migration Assistant:

For the future, create a Time Machine Backup, and use the Migration Assistant to grab certain items back. So, crate a backup today, and every-so-often. Note that you'd have to format the drive accordingly.

I’ve used disk drill before to successfully recover what I thought was a fried disk. I wasn’t able to recover the exact image of the drive but most of the important contents. It will take a while for disk drill to do its work. No guarantee but it worked for me.