function Invoke-GdiskGuid($creationtype, $disksize, $disknum) {
#($guiddisk, $guidpart1, $guidpart2, $guidpart3, $guidpart4, $guidpart5)
$xboxone = @("a", "c")
$duplicate = @("b")
$guid500gb = @("a", "d")
$guid1tb = @("b", "e")
$guid2tb = @("c", "f")
if...