Recovering a Mac OS Extended partition.

How to use TestDisk to recover lost partition
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robertosc
Posts: 2
Joined: 10 Apr 2019, 11:30

Recovering a Mac OS Extended partition.

#1 Post by robertosc » 12 Apr 2019, 23:51

Can you please help me recovering my backup HDD? I don't know how to proceed.

It's a WD Elements 1.5TB, one 1TB exFAT partition that successfully gets mounted and a 0.5TB that doesn't get mounted.

This is what I get when running Testdisk:
Screen Shot 2019-04-10 at 10.26.48 PM.png
Screen Shot 2019-04-10 at 10.26.48 PM.png (58.35 KiB) Viewed 97 times
I ran Testdisk many times, I used to see a "EFI System" partition but I think I screw it up when I told it to write the partitions. Is it some sort of boot partition? If so, I guess it doesn't matter because I don't boot using this disk.

Doing a quick search I get this:
Screen Shot 2019-04-10 at 10.31.20 PM.png
Screen Shot 2019-04-10 at 10.31.20 PM.png (72.92 KiB) Viewed 97 times
(that's the same result I got before, it didn't list the EFI System partition and that's the reason I said I think I screw it up - I told it to write this tree)

Running the deep search I got this:
Screen Shot 2019-04-13 at 10.34.32 AM.png
Screen Shot 2019-04-13 at 10.34.32 AM.png (81.48 KiB) Viewed 97 times
I'm stuck on this part. Two repeated partitions. I think I'm supposed to mark one of them as primary and let the other be deleted. But I don't know which is which since I there is no support for listing files of HFS partitions.

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cgrenier
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Re: Recovering a Mac OS Extended partition.

#2 Post by cgrenier » 13 Apr 2019, 07:35

The partition table looks OK. You should try fsck, something like
<pre>
sudo fsck /dev/disk2s1
</pre>
What is the result ?

robertosc
Posts: 2
Joined: 10 Apr 2019, 11:30

Re: Recovering a Mac OS Extended partition.

#3 Post by robertosc » 15 Apr 2019, 00:23

Thank you for your answer.

I ran fsck_hfs /dev/disk2s1 and got this:

Code: Select all

   Executing fsck_hfs (version hfs-366.70.3).
** Checking Journaled HFS Plus volume.
   Invalid B-tree node size
(3, 0)
** The volume   could not be verified completely.

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