Proxmox Autoinstall selecting installation usb as target disk at installation

Ironwally

New Member
Apr 22, 2026
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Hi everyone,

I'm currently setting up a proxmox auto-installation.
When booting from the iso, Proxmox tries to install itself onto the usb drive. How do I know it? The installation fails after purging the disks and then trying to create the partitions. After that I have to reformat the usb to use it again.

Do I maybe have an error in my answerfile? How can I correctly specify the disks that are supposed to be used for proxmox installation?

My answerfile.toml disk setup:

```
[disk-setup]
filesystem = "zfs"
zfs.raid = "raid0"
disk-list = ["sda", "sdb"]
```

Thanks in advance!
 
https://pve.proxmox.com/wiki/Automated_Installation#Disk_Setup_Section

Hi, may it be possible that your physical disks in the server are not seen as ["sda","sdb"] e.g. because they are SSDs/NVMEs.
Than very likely your USB-Stick is very likely recognized as /dev/sda
So the installer is just doing his job like requested, but might have some errors after deleting your install device.

BR, Lucas