Takes an array of folder locations and exports a CSV file with the file hash, name and directory name.

Find-DuplicateFiles.ps1

$FolderLocation = @("FilePath1", "FilePath2", "FilePath3")
$AllFiles = @()
$FileList = @()
foreach($RootFolder in $FolderLocation) {
    $AllFiles += Get-ChildItem -Path $RootFolder -File -Recurse
}
foreach($File in $AllFiles) {
    $FileHash = Get-FileHash $File.PSPath | Select-Object Hash -ExpandProperty Hash
    $FileInfo = [PSCustomObject]@{
        Folder = $File.DirectoryName
        FileName = $File.Name
        "FileSize (KB)" = [math]::Round($File.Length / 1KB,2)
        FileHash = $FileHash
    }
    $FileList += $FileInfo
}
$Filelist | Export-CSV -NoTypeInformation "File Information.csv"