The MBR contains the Partition Table, however when you do an fdisk /mbr, it only overwrites the boot code of the MBR, and leaves the partition table unchanged. Both the boot code and the PT are ...

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.

The partition table configuration on a physical hard disk is standardized by GPT, which employs globally unique identifiers (GUID). Another type of partition table is the MBR.

The MBR contains boot code, a partition table, and a signature value. The boot code contains the instructions that tell the computer how to process the partition table and locate the operating system.

This 512-byte space then is split up into two smaller sections. The first 446 bytes of the MBR contain the boot code—code like the first stage of GRUB that allows you to load an operating system. The ...

This will first display the registered partition details, if possible, before allowing you to perform a quick search for the table configuration within the data on the drive.

You can see what happens with the partition table after the system is infected with TDL4 in the figure below. As a result of these manipulations, the MBR code remains untouched.

Attempting to sync the partitions in step 5 doesn't work, it says the MBR partition table is invalid and overlaps. If I go ahead and write changes my Mac is no longer bootable.

The partition table configuration on a physical hard disk is standardized by GPT, which employs globally unique identifiers (GUID). Another type of partition table is the MBR.