From 08452f740b0adc1ffd863e6ea86885d4cd7bc835 Mon Sep 17 00:00:00 2001
From: Leo Neubecker <leo.neubecker@gmail.com>
Date: Mon, 9 Feb 2026 23:27:59 +0100
Subject: [PATCH] Fix error when mounting VM with multiple drives

---
 FastGPU-P/Form1.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/FastGPU-P/Form1.cs b/FastGPU-P/Form1.cs
index c4e777b..6e7e25f 100644
--- a/FastGPU-P/Form1.cs
+++ b/FastGPU-P/Form1.cs
@@ -213,7 +213,8 @@ Function Add-VMGpuPartitionAdapterFiles {
 }
 
 ""Mounting Drive...""
-$DiskNumber = (Mount-VHD -NoDriveLetter -Path $VHD.Path -PassThru | Get-Disk).Number
+$VHDPath = if($VHD.Path -is [string]) {$VHD.Path} else {$VHD.Path[0]}
+$DiskNumber = (Mount-VHD -NoDriveLetter -Path $VHDPath -PassThru | Get-Disk).Number
 $PartitionNumber = (Get-Partition -DiskNumber $DiskNumber | Where-Object {$_.Type -eq ""Basic""}).PartitionNumber
 $UsedLetters = Get-CimInstance -ClassName Win32_LogicalDisk | Select-Object -ExpandProperty DeviceID | ForEach-Object { $_.ToString()[0] }
 $DriveLetter = [char[]](67..90) | Where-Object { $_ -notin $UsedLetters } | Select-Object -First 1
@@ -223,7 +224,7 @@ Function Add-VMGpuPartitionAdapterFiles {
 Add-VMGPUPartitionAdapterFiles -hostname $Hostname -DriveLetter $DriveLetter -GPUName $GPUName
 
 ""Dismounting Drive...""
-Dismount-VHD -Path $VHD.Path
+Dismount-VHD -Path $VHDPath
 
 If ($state_was_running){
     ""Previous State was running so starting VM...""