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Warn about ExFAT boot limitations in Make2023BootableMedia #482

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Warn about ExFAT boot limitations in Make2023BootableMedia #482

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9 changes: 6 additions & 3 deletions scripts/windows/Make2023BootableMedia.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
.NOTES
File Name : Make2023BootableMedia.ps1
Author : Microsoft Corporation
Version : 1.5
Version : 1.6
Date : 2026-10-27

.LICENSE
Expand Down Expand Up @@ -620,6 +620,9 @@ function Validate-Parameters {
Write-Host "`r`n-USBDrive must specify a valid drive letter. ($USBDrive invalid!)`r`n" -ForegroundColor Red
return $false
} else {
if ($FileSystem -eq "ExFAT") {
Write-Host "`r`nWARNING: Most UEFI systems cannot boot from ExFAT. Use FAT32 unless the target firmware supports booting from ExFAT." -ForegroundColor Yellow
}
Write-Host "`r`nWARNING: Contents on drive [$USBDrive] will be erased! Continue? (Y/N) " -ForegroundColor Yellow
$response = Read-Host
if ($response -ne "Y") {
Expand All @@ -634,7 +637,7 @@ function Validate-Parameters {
Write-Dbg-Host "Partition size: $($partition.Size / 1GB)GB"
if ($partition.Size -gt 32GB) {
Write-Host "Target drive partition is larger than 32GB and cannot be formatted as FAT32. " -ForegroundColor Red
Write-Host "Create a partition smaller than 32GB and try again (or use ExFAT)." -ForegroundColor Red
Write-Host "Create a partition of 32GB or smaller and try again." -ForegroundColor Red
return $false
}
}
Expand Down Expand Up @@ -1062,7 +1065,7 @@ $global:Dbg_Pause = $false
$global:Dbg_Output = $DebugOn

try {
Write-Host "`r`n`r`nMicrosoft 'Windows UEFI CA 2023' Media Update Script - Version 1.4`r`n" -ForegroundColor DarkYellow
Write-Host "`r`n`r`nMicrosoft 'Windows UEFI CA 2023' Media Update Script - Version 1.6`r`n" -ForegroundColor DarkYellow

# First validate that the required tools/environment exist
$result = Validate-Parameters -TargetType $TargetType -ISOPath $ISOPath -USBDrive $USBDrive -NewMediaPath $NewMediaPath -FileSystem $FileSystem -StagingDir $StagingDir
Expand Down
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