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Solved THANK YOU SO MUCH cgrenier!!! I made a mistake in which file system I chose. Instead of mac file system, I chose EFI GUID which was actually correct and was able to use the write function to fix the disk. Although it still appears unallocated in disk manager, I can now boot into macos and ...

By the way in case this would help, I have a mac installer flash drive.

Hi, thank you for the fast reply. I checked out the testdisk pdf and it was helpful. However, when I ran the analysis of the disk, It detected the problem but said that the "write" method was not supported for mac drives. Here is the log


Mon Jan 16 23:19:00 2017
Command line: TestDisk

TestDisk 7 ...

Hi I just downloaded Test Disk because I can't boot into mac os. When I went to disk utility in windows, It said the partition was unallocated space. I did not format or delete any of the partitions but just randomly disappeared. In the mac installer, disk utility also could not detect the disk ...