EASEUS Partition Master

portable such system tool makes not much sense.
Work on system partitions can be done anyway only when partition not in use, that means system has to reboot anyway and the changes will be done before the system start. Therefore you are much better off with something like parted magic which you can boot from CD or USB stick and do all work and changes stright away.

With eseus, you can make some changes to some data partitions, provided you have all admin rights to do so, but the rest has to be done when windows is not running. For that installed eseus uses small OS which it is booting to, making changes and then leaving this system and rebooting windows.

So I can not see any practical use for such app to be portable.

Well if you have all admin rights, then you could certainly format usb sticks with it, but for that single use there are many other smaller and faster apps around.

and winPE is contriversial due to it using code from windows that was not Cleanroom Reverse Enginered.

definitely, what ever they told you that it will modify windows partition while running is wrong, it will not, definitely.

It will make you feel as if it does something, but then it will ask you to reboot.
Before the windows will boot, the changes will be applied.
It only tells you, that now all was changed, while it was not. Next time oyu boot, the real changes apply. The work done while runnig is maily defrag etc.

What it can modify, is a data partition which is not a system partiton. This is nothing special, you can do it with the windows partitioning tool too.

Portble version is therefore of no special use, it needs admin rights and in needs reboot as it will not work while winodws is running anyway.

Therefore you can use any other partitioning tool, which come in some kind of bootable version and do all work there.

ntfs windows partitions should be modifyied with windows own tool best, rest , e.g setting up linux partitions etc, can be done with something like partedmagic etc.

They aslo claim often that the software will change dynamic poartition to basic. I can only warn that this will result in los of all data on such partitons. I do not much care as what is stated on some website, I test it myself and see: only complete reformat of the whole disk, was needed. Not even testdisk was able to sort out the mess done after this operation.

fdisk if just for destruction of partition table

There are MANY useful purposes for this.

A great example of where this is useful is if you have a USB to IDE/SATA adapter with you, and a laptop. Take a hard disk that has a corrupt partition, (could even be another laptop HDD) connect it to the adapter, and windows will have block level access to the disk.

From there you can use whatever partitioning tools you deem necessary, including partition recovery and file recovery tools.

I find this method IMMENSELY easier than booting up a CD inside of the computer with the dead disk, namely because when you have a live operating system with full network access, already installed proper drivers and whatnot, you can easily move files and data off of said disk. This can be difficult, annoying, or both when you are booting to an alternative operating system.

Instead of doing the above, just pop the disk out (You do have an easy removal tray, right? All modern cases have them) connect it to your working PC, (no disassembling or rebooting required) and have at it for disk forensics.

Another purpose, is windows doesn't allow you to create or access multiple partitions on a flash drive that has the "removable" bit turned on, which is the vast majority of USB sticks and cannot be changed for 99% of them. Programs like this and Active@ Partition Manager allow you to create and access these additional partitions.

Unfortunately Active@ Partition Manager doesn't seem to work with windows 8, and doesn't appear to be in development anymore, so I need to find an alternative. If you're still on Windows 7, that's great because A@PM is already portable out of the box.

The nice thing about EaseUS though is that in addition to willy nilly repartitioning, it also has partition header recovery features and raw partition image backup and reading.

so far I am using many flash devices for many years. I have so far not encountered any one that either could not be repaired by standard windows utility or if not then the controller inside the flash device was defective.
Defect controller is probably most common problem and there no software will help.
Simply broken file system can be corrected by windows own utility.