I have a mac HFS+ drive that was failing. I cloned it using ddrescue on my PC. There were some errors especially in the beginning.

So after the clone was done I plugged it into a Mac, but it doesn't come up.

Using the PC I tried scanning with testdisk and writing the partition structure but it failed (I forget the error).

I have it plugged in into my PC running R-Studio and all the files are there.

How can I repair the mac partition structure using my PC?

Most of the beginning sectors appear to be 00's so I guess I have to fix that, but what is the best automatic way of doing that since testdisk failed?

Thanks,

One way would be to install MacDrive then use it's Repair function (but not free). There may be a free option out there. You can also try in Mac again, open Disk Utility, see if you can "Repair Disk" from there. If that can't finish, you can also try Disk Warrior (not free) on the Mac. As always, best to work on a clone, you may want to clone your clone before you start messing with any "repair" function.

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$300 Data Recovery - Los Angeles Data Recovery

This is good advice.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Thanks for the suggestions.

I downloaded the demo of MacDrive and it was able to see all the files on the drive and I was able to run the repair. I then plugged the drive into the Mac, but it still did not come up.

I then went into the mac Disk Utility and ran the verify...



Then I ran the repair...



Still won't show up. It does nothing when I press the mount button.

Unplug/re-plug, restart Mac. Should work now. If not, repair again with DU. If still doesn't work, DiskWarrior.

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$300 Data Recovery - Los Angeles Data Recovery

BTW… try clicking on the root drive ("931.5 GB WDC WD10…") not the partition ("FreeAgent D"), and then click "Repair Disk."

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$300 Data Recovery - Los Angeles Data Recovery

If you boot from the osx install dvd and select disk utilities from the menu you might be able to complete the repairs and get the drive to boot. In effect this would be using a free tool.