$overSize = 100MB;
$out = 'usage-report.txt'

function inFiles($location) {
	echo 'Collecting information for location '+$location+'...'
	return ls $location -rec | ? {$_.Length -gt $overSize}
}

function outFiles($collection) {
	$collection | 
	sort length | 
	ft 
		@{l="MB";e={[math]::round($_.Length/1MB)}},
		@{l="Name";e={ 
				if ($_.Name.Length -gt 37) {
					$_.Name.Substring(0,37 - $_.Name.Length + 
					$_.Name.LastIndexOf('.'))+
					'..'+
					$_.Name.Substring($_.Name.LastIndexOf('.'))
				} else {
					$_.Name
				}
			}
		},directory -auto |	
	out-file $out -width 1024 -app
}

$drive_c = inFiles('C:\');
$drive_d = inFiles('D:\');
$drive_e = inFiles('E:\');
$drive_f = inFiles('F:\');

echo '-- PER DRIVE --' > $out

echo '`nDrive C:' >> $out
outFiles($drive_c)

echo '`nDrive D:' >> $out
outFiles($drive_d)

echo '`nDrive E:' >> $out
outFiles($drive_e)

echo '`nDrive F:' >> $out
outFiles($drive_f)

echo '`n`n-- ALL DRIVERS --' >> $out
outFiles($drive_c+$drive_d+$drive_e+$drive_f)

echo '`nReport completed and saved in "usage-report.txt."'