The GUID Partition Table (GPT) replaces the previous master boot record (MBR). GPT partitions can hold 18 exabytes compared to 2.2TB for the MBR.

Now with a little bit of searching I've found a Windows based tool that claims it can recover a GUID partition table called Partition Guru Professional Edition (the free version does not handle ...

What actually happens is that it interprets the GPT partition table incorrectly, and that causes it to get confused about what is where on the disk.

We need to ensure that the partition style is a GUID Partition Table (GPT) or a Master Boot Record (MBR). For that, run list disk. Check if the “Gpt” column contains an asterisk (*).

2] Convert drive to GPT MBR (Master Boot Record) and GPT (GUID Partition Table) are two different ways of storing the partitioning information on a drive.

Note that this command works only on Intel Macs with hard disks formatted using the GPT (GUID Partition Table) format with a journaled Hierarchical File System Plus (HFS+) file system.