Question

Below is the code for checking the disk space:

$disks = Get-WmiObject -ComputerName WDSMS01 -Namespace root\cimv2 -Query "Select * from Win32_LogicalDisk where DriveType=3"

$disks.DeviceID
$dsql01 = @()

foreach($db in $disks)
{
    $dsql = New-Object PSObject
    $dsql | Add-Member -MemberType NoteProperty -Name "Drive Name" -value $db.DeviceID
    $dsql | Add-Member -MemberType NoteProperty -Name "Total Space(GB)" -value ($db.Size/1GB)
    $dsql | Add-Member -MemberType NoteProperty -Name "Free Space(GB)" -value ($db.FreeSpace/1GB)
    $dsql01 += $dsql
}

$dsql01

Is it possible to limit the decimals by 2 digits? Also, add another column that computes free space in % format.

Thanks.

Answer 1

This depends a bit on what exactly you need. You can use [Math]::Round to round off everything after two digits:

[Math]::Round($db.Size/1GB, 2)

but that can leave you with numbers that have less than two digits if they are followed by zeroes, e.g. 14.6 which doesn’t look as nice in a table.

The other option is to format the numbers:

($db.Size/1GB).ToString('0.00')

which will always use the same number of decimal digits, but results in a string, so performing further calculations can be hindered by that.

As for your second question, that’s actually trivial, just add another Add-Member call:

$dsql | Add-Member NoteProperty 'Free Space (%)' (100*$db.FreeSpace/$db.Size)

Also you can (in PowerShell v2) put all those in a single New-Object call:

$dsql = New-Object PSObject -Property @{
    'Drive Name' = $db.DeviceID
    'Total Space (GB)' = $db.Size / 1GB
    'Free Space (GB)' = $db.FreeSpace / 1GB
    'Free Space (%)' = 100 * $db.FreeSpace / $db.Size
}

And while we’re at it, foreach loops are so not PowerShell-y. Let’s rewrite that with a pipeline:

$disks = Get-WmiObject -ComputerName WDSMS01 -Namespace root\cimv2 -Query "Select * from Win32_LogicalDisk where DriveType=3"
$disks.DeviceID
$dsql01 = $disks | ForEach-Object {
    New-Object PSObject -Property @{
        'Drive Name' = $_.DeviceID
        'Total Space (GB)' = $_.Size / 1GB
        'Free Space (GB)' = $_.FreeSpace / 1GB
        'Free Space (%)' = 100 * $_.FreeSpace / $_.Size
    }
}