DiskSpace Script not capturing all local disks - Help Please

Question

Hello,
I am using a script to capture disk size for all local disks, however it is reporting incorrect disk sizes (example C drive reported as 30GB however it is actually50GB). It is also not reporting all local disks. Any help with below?
$erroractionpreference = “SilentlyContinue”
$a = New-Object -comobject Excel.Application
$a.visible = $True
$b = $a.Workbooks.Add()
$c = $b.Worksheets.Item(1)
$c.Cells.Item(1,1) = “Machine Name”
$c.Cells.Item(1,2) = “Drive”
$c.Cells.Item(1,3) = “Total size (GB)”
$c.Cells.Item(1,4) = “Free Space (GB)”
$c.Cells.Item(1,5) = “Free Space (%)”
$c.cells.item(1,6) = "Name "
$d = $c.UsedRange
$d.Interior.ColorIndex = 19
$d.Font.ColorIndex = 11
$d.Font.Bold = $True
$d.EntireColumn.AutoFit()
$intRow = 2
$colComputers = get-content "C:\Servers.txt"
foreach ($strComputer in $colComputers)
$colDisks = get-wmiobject Win32_LogicalDisk -computername $strComputer -Filter “DriveType = 3"
foreach ($objdisk in $colDisks)
$c.Cells.Item($intRow, 1) = $strComputer.ToUpper()
$c.Cells.Item($intRow, 2) = $objDisk.DeviceID
$c.Cells.Item($intRow, 3) = “{0:N0}” -f ($objDisk.Size/1GB)
$c.Cells.Item($intRow, 4) = “{0:N0}” -f ($objDisk.FreeSpace/1GB)
$c.Cells.Item($intRow, 5) = “{0:P0}” -f ([double]$objDisk.FreeSpace/[double]$objDisk.Size)
$c.cells.item($introw, 6) = $objdisk.volumename
$intRow = $intRow + 1
$d.EntireColumn.AutoFit()
cls

Answer 1

I've just tested your script as is, and it worked perfectly.
Are you sure those drives are regular?
Have you tried just printing the results in the console instead of Excel? there might be some setting there that changes what you see.
Also, have you considered the conversion between bytes and GB are misleading?