There Are Hidden Partitions On Your Hard Drive Keeping Your Computer Safe - Here's How To Find Them

Your hard drive may appear like it doesn't have all of its space available, but its actually hidden partitions. Here's why you may need them.
Ars Technica

Clone bootable 2TB MBR 3 partition to a 4TB GPT bootable 3 partition

The 2TB MBR is/was the Backup W7 Pro with only 7 installed programs (the Portables accessed like the other drive), both w/o hidden partitions and both with other partition (s). That O/S is just a ...