protected function getInputAndOutputDisk()
    {
        $validInputPath = FALSE;
        $validOutputPath = FALSE;

        //runs as long as user enters valid input root path
        while(!$validInputPath){
            $goBack = FALSE;
            $rootInput = $this->choice('Which input disk?', array_keys(config('filesystems.disks.cms.migrations')), 0);
            if ($rootInput == 'custom_input') {
                while(!$validInputPath && !$goBack){
                    $rootInput = $this->ask('Please enter root-Path for Input-CMS');
                    if ($rootInput === 'x'){
                        $goBack = TRUE;
                    }
                    if(!file_exists($rootInput)){
                        $this->info('Invalid Path! Please enter valid Root-Path');
                        $this->info("\n" . '[x] -> Go back');
                    }
                    else {
                        $validInputPath = TRUE;
                    }
                }
            } else{
                //default-input-path
                $validInputPath = TRUE;
            }
        }
        //runs as long as user enters valid output root path
        while(!$validOutputPath){
            $goBack = FALSE;
            $rootOutput = $this->choice('Which output disk?', array_keys(config('filesystems.disks.cms.migrations')), 1);
            if ($rootOutput == 'custom_output') {
                while(!$validOutputPath && !$goBack){
                    $rootOutput = $this->ask('Please enter root-Path for Output-CMS');
                    if ($rootOutput === 'x'){
                        $goBack = TRUE;
                    }
                    if(!file_exists($rootOutput)){
                        $this->info('Invalid Path! Please enter valid Root-Path');
                        $this->info("\n" . '[x] -> Go back');
                    }
                    else {
                        $validOutputPath = TRUE;
                    }
                }
            } else{
                //default-output-path
                $validOutputPath = TRUE;
            }
        }
        return array($rootInput, $rootOutput);
    }