I have a 2012 macbook pro, upgraded RAM & 500gb SSD a few years back. Boot disk is OSX 10.9.5
I created a partition 3 years ago so I could run a newer OS (macOS Catalina (version 10.15) required for some apps, worked great until yesterday
Now, I cannot boot into the new OS at startup. Running Disk Utility shows the partition name has been changed to "disk0s4". I cannot mount, unmount, or do anything within Disk Utility with this partition...
After some googling I discovered testdisk, and got it running, but as soon as I select a drive I get this message:
Can someone point the way to get write access fixed, and maybe walk me through the rest of the procedure so I can maybe get some data back?Write access for this media is not available.
TestDisk won't be able to modify it.
- No partition from this disk must be mounted:
Open the Disk Utility (In Finder -> Application -> Utility folder)
and press Unmount button for each volume from this disk
- This media may be physically write-protected, check the jumpers.
Maybe worth mentioning, I believe I was able to copy something from the partition in question, it is saved as image.dd - is there anything I can do with this for recovery?
Thank you very much