Know your Media Library disk usage with a simple PowerShell script

ShowMediaLibraryDiskSpace.ps1

# Define your Media Library path - With no changes, this will take the full Media Library
$mediaLibraryPath = "/sitecore/media library"

$mediaLibrary = Get-Item -Path $mediaLibraryPath
$totalSize = 0
$mediaLibrary | Get-ChildItem -Recurse | ForEach-Object {
    if ($_.Fields["Size"] -ne $null -and $_.Fields["Size"].Value.Trim() -ne "") {
        $totalSize += $_.Fields["Size"].Value
    }
}

# Output the used disk space 
$totalSizeMB = [math]::Round($totalSize / 1MB, 2)
Write-Output "Total Media Library Size: $totalSizeMB MB"