Sysprep and Windows (Server)

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kosta88

New Member
Sep 5, 2025
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Hello,
I noticed that I cannot sysprep a finished server 2025, my guess is that after I install the virtIO drivers, if I sysprep, it will delete those, and make disk inaccessible.
Is the only way to use a disk that is not virtio dependable, or are there other solutions? Maybe inserting drivers into the ISO, would that make it permanent?
Thanks
 
I've used sysprep with Windows 10/11 and Server 2016 to 2022 on Proxmox without problems
Did you add the driver in early setup as described in the wiki?
How did you start sysprep? At OOBE with ctrl+shift+f3
 
I pressed ctrl+shift+f3 at OOBE, machine rebooted, came up with sysprep opened. Then I installed drivers and windows updates without closing sysprep. After installing updates, rebooted as required, on the next boot, sysprep opened again, then I choose OOBE, generalize and shutdown.
 
It does. I think I fixed it. Just a question though: now that I have that in... can I actually repeat the process with the current installation? Like, sysprep it, boot to OOBE, press that keycombo, setup whatever I need additionally, update drivers, and then sysprep/generalize it again?
 
You mean run into sysprep in the clone, like in the initial installation? Yes ist works. Press ctrl+shift+f3 at OOBE, like you did installing from DVD.
In past Windows versions, there was a limit of sysprep runs in one installation. Starting with Windows 10 I have not reached.
I've got one Image, which I use every mounthan add the latest updates.

Waht was the fix?
 
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