Your Mac OS X was probably using EFI GPT partition table and grub may be detecting it.
When you start TestDisk, select the disk and choose EFI GPT, Analyse.
If you see your partitions, take a screenshot, save this screenshot somewhere safe, select Backup, choose Quick Search, Load the backup, use your screenshot to get the same partitions, go on next screen, compare with the screenshot and if the results are ok, choose to rewrite the partition table.
You will have to repair your installation to repair the damage caused by dd, but if no mistake is done, you should be able to boot again and access all your data.
Accidentally dd'd my Mac drive...
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When asking for technical support:
- Search for posts on the same topic before posting a new question.
- Give clear, specific information in the title of your post.
- Include as many details as you can, MOST POSTS WILL GET ONLY ONE OR TWO ANSWERS.
- Post a follow up with a "Thank you" or "This worked!"
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Before posting, please read https://www.cgsecurity.org/testdisk.pdf
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Re: Accidentally dd'd my Mac drive...
TestDisk can't list the content of HFS partition. Usually for the correct HFS partition, TestDisk 7.0 or later will display at the bottom of the screen some information (ie. blocksize) and " + Backup".
As the beginning of the partition may have been overwritten, fsck may have to use a backup HFS block to access and repair the filesystem.
As the beginning of the partition may have been overwritten, fsck may have to use a backup HFS block to access and repair the filesystem.