Windows Gurus -- Why does this process always take a long time ?


jimbo45

jimbo45

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Hi folks
Using UUPDUMP to create the Windows install ISO -- why does the procees "Unmounting Image" seem to take an in-ordinate amount of time comaprated to all the other things the iso creation process from UUPDUMP does.

What's it actually doing (4 GAWD's SAKE).

Screenshot 2024-03-02 135229.png

Any Windows Gurus out there who can enlighten me.

Cheers
jmbo
 

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The speed depends on image size and modifications and storage speed where IOS image created.
 

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Windows imaging is like opening a jar where you pour out all the jelly on the table, once done you have to scrape all the jelly from the table back into the jar and screw the lid back on. That's why it's slow.

EDIT: Maybe a better analogy is to use pearls where you put them back in a specific order.
 

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My Internet connection is pretty good and I have lots of storage space. I'm downloading the latest Release Preview Win 11 and it takes like 4-5 hours.
Guess its a lot of jelly all over the table. Must be a faster way.....
 

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jimbo45 said:
Hi folks
Using UUPDUMP to create the Windows install ISO -- why does the procees "Unmounting Image" seem to take an in-ordinate amount of time comaprated to all the other things the iso creation process from UUPDUMP does.

What's it actually doing (4 GAWD's SAKE).
Click to expand...
Unmounting an image and committing changes requires DISM to create a new WIM file. It's takes forever because a WIM file is always a compressed file (technically there is an uncompressed format, but nobody uses it).

There's several operations going on at the same time:
  • Preservation of mount folder hard links (to prevent file duplication).
  • When there's multiple images in the WIM, de-duplication is happening (which saves a lot of room on multi-edition images based on the same Windows release).
  • Archive compression using LZX format.
  • If you have real-time file scanning enabled, and don't turn it off or exclude UUP dump's folders, then it's always rechecking the enormous work-in-progress image file.
The only thing worse than unmounting is converting WIM->ESD.
 

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