1.    25 Mar 2016 #1
    Join Date : Mar 2016
    Posts : 1
    Windows 10 Pro

    Why is the ISO size different for Tech bench and MCT?

    I downloaded Windows 10 64bit International English from techbench and the size is 4.09GB
    In both cases I selected Windows 10(not home or pro or single language or n or kn just Windows 10)
    Language:British English(english international)
    I created same iso using MCT and size is 3.38 GB.
    Why is there such a size difference?
    I compared the two iso using Winmerge and these difference showed up::

    Click image for larger version. 

Name:	2016-03-26.png 
Views:	7 
Size:	129.1 KB 
ID:	71475Click image for larger version. 

Name:	2016-03-26 (1).png 
Views:	6 
Size:	118.2 KB 
ID:	71476

    Left: iso from techbench
    Right: iso from MCT

    The difference: 1) In sources folder techbench has Install.wim which is 3.59 GB while MCT has Install.ESD which is 2.87 GB

    2)In sources folder techbench Boot.wim is 274,678 KB while MCT Boot.wim is 274,627 KB
    3)In sources folder techbench iso has no ws.dat file while MCT has ws.dat file.
    4)In root folder techbench iso has no MediaMeta.xml file while MCT iso contains it.

    Download location for Techbench iso:https://www.microsoft.com/en-us/soft...load/techbench
    Download location for MCT: https://www.microsoft.com/en-us/soft...load/windows10
    Last edited by avg; 26 Mar 2016 at 00:21.
      My ComputerSystem Spec
  2.    26 Mar 2016 #2
    Join Date : Dec 2015
    Posts : 6,355

    Install.esd is a more compressed version than install.wim.

    There is no difference although one may have more recent updates than the other included. Makes no difference as install updates quickly to latest version.
      My ComputerSystem Spec
  3.    27 Mar 2016 #3
    Join Date : Dec 2013
    Portsmouth Hampshire
    Posts : 1,868
    Windows 10 x86 14383 Insider Pro and Core 10240

    Hi AVG, welcome to Tenforums. Since you are obviously inquisitive, you may wish to look inside the .wim and .esd files to see why they vary. You can do this with the latest version of 7-Zip:


    You can even use the 2-panel view to compare the two side by side.
      My ComputersSystem Spec


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