Til Hol

#Collect removeable devices (usb drives)
$usb_drives = get-volume |
    Where-Object {
        $_.DriveType -eq 'Removable'
    }

foreach ($usb in $usb_drives) {
    #variables
    $usbFileSystemName = "NewUsbStickName"
    $srcFolderPath     = "c:\temp"

    #logic to format usb
    Format-Volume -Path $usb.DriveLetter -FileSystem NTFS -NewFileSystemLabel $usbFileSystemName

    #logic to transfer files from src to dst on usb
    Copy-Item -Path $srcFolderPath -Destination $usb.DriveLetter -Recurse -Force

    #logic to eject usb device
    $Eject = New-Object -comObject Shell.Application
    $Eject.NameSpace(17).ParseName($usb.DriveLetter + ":").InvokeVerb("Eject")
}