Install Ventoy 1.0.xx in a Multibootsystem Partition

[Steve2926]

Ventoy has specific requirements.
https://ventoy.net/en/doc_disk_layout.html

Ptn1 must start at 2048
Ptn2 must start immediately after end of ptn1
Ptn2 must be VTOYEFI and must be exactly 32MB in size

Ventoy will report an error if this is not seen.