Differences between Windows 8 Pro x64 Upgrade ISO and TechNet ISO?

Discussion in 'Windows 8' started by shinji, Oct 30, 2012.

  1. shinji

    shinji MDL Novice

    Sep 27, 2009
    20
    1
    0
    For some reason the Windows 8 x64 Pro ISO that I got from TechNet and the Upgrade ISO is different. Is there any reason for the differences? One of the big ones is size. The downloaded ISO from the upgrade program is ~0.6GB smaller than the one I pulled from my TechNet account.

    TechNet ISO: A5889F86
    Upgrade ISO: 6F8E5826

    P.S. - Found the difference in size in the install.wim file. Why is it smaller?
     
  2. mdc

    mdc MDL Junior Member

    Jul 22, 2010
    78
    120
    0
    The upgrade ISO uses a compressed/encrypted .esd file instead of a .wim file to pack the base installation.
     
  3. moderate

    moderate MDL Guru

    Aug 31, 2009
    2,652
    2,180
    90
    also the Upgrade Assistant checks for time and date before it builds the ISO and writes that information to ISO file, so even two upgrade ISOs will be different in hash...
    also some ISO from Upgrade Assistant have already included available Windows Updates...
     
  4. shinji

    shinji MDL Novice

    Sep 27, 2009
    20
    1
    0
    So the smaller install.wim file is actually compressed/encrypted?
     
  5. abbodi1406

    abbodi1406 MDL KB0000001

    Feb 19, 2011
    8,102
    27,033
    270
    TechNet ISO/wim has Pro + Core
    Upgrade ISO/wim has only Pro
     
  6. Rayearth

    Rayearth MDL Novice

    Aug 3, 2012
    6
    0
    0
    Can the Upgrade ISO be used as bootable for a clean install?
     
  7. lgj1952

    lgj1952 MDL Member

    Jul 24, 2009
    159
    80
    10
    Yes you can, msdn ISO also works with upgrade key
     
  8. snorge

    snorge MDL Novice

    Aug 15, 2012
    45
    2
    0
    Does it really slipstream the updates for you when you create the ISO?
     
  9. snorge

    snorge MDL Novice

    Aug 15, 2012
    45
    2
    0
    bump to my post.
     
  10. EC51

    EC51 MDL Novice

    Nov 4, 2012
    21
    1
    0
    No, it does not.