I need to capture+apply an entire disk image with Windows Full Flash Update (FFU) It seems an interesting improvement compared to WIM images, also they state that it is faster... but it doesn't seem so to me. My system is composed by:

  • Boot partition (less than 500 MB)
  • Windows 10 IoT Enterprise 2016 partition (60 GB, 50% used)
  • Another primary partition (40 GB, 30% used)

Also, the hardware is pretty good! Intel i7-7700H, 32 GB RAM, 128 GB SSD.

I boot with a WinPE (latest ADK version - Windows 10, 1809) USB and run this:

powercfg /s 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c DISM.exe /capture-ffu /imagefile=g:\test.ffu /capturedrive=\\.\PhysicalDrive0 /name:disk0

It took 2 hours to complete and generate a 30 GB FFU file. The version of DISM is 10.0.17763.1

Same thing for the apply phase:

powercfg /s 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c DISM.exe /apply-ffu /imagefile=g:\test.ffu /applydrive:\\.\PhysicalDrive0

It seems slow to be because in this article the author says "FFU takes about 15 minutes to create a 28 GB FFU image".

  • I assume you are taking an image of a physical machine instead of a virtual machine? I assume the time difference is the second partition you are creating image of (and the fact you likely have 50% more data) then the author did). – Ramhound Dec 14 '18 at 8:41
  • Yes it is a physical machine. You say that the second partition may slow down everything? It seems way too much slowdown to me... – TheUnexpected Dec 14 '18 at 8:42
  • @Ramhound yes, my data is 50% more... but the hardware is faster so I expected, more or less, 15x2 minutes... 2 hours is an huge difference instead. – TheUnexpected Dec 14 '18 at 8:52
  • 1
    Your hardware isn't that much faster, and the major bottlekneck in this case, would be the storage device. Your faster processor wouldn't have that much of an impact on I/O reads and writes. – Ramhound Dec 14 '18 at 16:45

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