Check free disk space on Windows with PowerShell script

We want to check free disk space on all the domain-joined Windows systems. These are the Windows Server and Windows clients. An excellent way to retrieve the disk space is with PowerShell. In this article, we will check all free disk space with PowerShell for Windows Server, Windows 10, and Windows 11.

Prepare check free disk space PowerShell script

Download the script Get-DiskSpaceReport.ps1 or copy and paste the below code into Notepad. Give it the name Get-DiskSpaceReport.ps1 and place it in the C:\Scripts folder. Create a Scripts folder if you don’t have one.

<#
    .SYNOPSIS
    Get-DiskSpaceReport.ps1

    .DESCRIPTION
    Export all enabled Windows Servers disk space to CSV file.

    .LINK
    www.alitajran.com/check-free-disk-space-windows-powershell-script

    .NOTES
    Written by: ALI TAJRAN
    Website:    www.alitajran.com
    LinkedIn:   linkedin.com/in/alitajran

    .CHANGELOG
    V1.00, 02/17/2022 - Initial version
    V1.10, 11/03/2023 - Added OS name and OS version
#>

Set-ExecutionPolicy Unrestricted -Force
Import-Module ActiveDirectory

# Delete reports older than 60 days
$OldReports = (Get-Date).AddDays(-60)

# Location for disk reports
Get-ChildItem "C:\Temp\DiskSpaceReport\*.*" |
Where-Object { $_.LastWriteTime -le $OldReports } |
Remove-Item -Recurse -Force -ErrorAction SilentlyContinue

# Create variable for log date
$LogDate = Get-Date -Format yyyyMMddhhmm

# Get all systems
$Systems = Get-ADComputer -Properties * -Filter { OperatingSystem -like "*Windows Server*" } |
Where-Object { $_.Enabled -eq $true } | Select-Object Name, DNSHostName, OperatingSystem, OperatingSystemVersion | Sort-Object Name

# Loop through each system
$DiskReport = ForEach ($System in $Systems) {
    $OperatingSystem = $System.OperatingSystem
    $OperatingSystemVersion = $System.OperatingSystemVersion
    Get-WmiObject Win32_LogicalDisk `
        -ComputerName $System.DNSHostName -Filter "DriveType=3" `
        -ErrorAction SilentlyContinue |
    Select-Object `
    @{Label = "HostName"; Expression = { $_.SystemName } },
    @{Label = "DriveLetter"; Expression = { $_.DeviceID } },
    @{Label = "DriveName"; Expression = { $_.VolumeName } },
    @{Label = "Total Capacity (GB)"; Expression = { "{0:N1}" -f ($_.Size / 1gb) } },
    @{Label = "Free Space (GB)"; Expression = { "{0:N1}" -f ($_.Freespace / 1gb ) } },
    @{Label = 'Free Space (%)'; Expression = { "{0:P0}" -f ($_.Freespace / $_.Size) } },
    @{Label = "Operating System"; Expression = { $OperatingSystem } },
    @{Label = "Operating System Version"; Expression = { $OperatingSystemVersion } }
}

# Create disk report
$DiskReport |
Export-Csv -Path "C:\Temp\DiskSpaceReport\DiskReport_$LogDate.csv" -NoTypeInformation #-Delimiter ";"

It will look like this in File Explorer.

Create a second folder with the name Temp and place it in the (C:) drive. After that, create a folder DiskSpaceReport and place it in the temp folder. That’s where the report will save after you run the script.

Do you want to change the path of the report? Remember to change the path in the PowerShell script on lines 28 and 59.

Before you run Get-DiskSpaceReport PowerShell script

Before you run the script, pay close attention to:

• The systems need to be online
• Run it on a domain-joined computer
• Administrator rights

Get free disk space for all Windows Servers

Run the PowerShell script Get-DiskSpaceReport.ps1. It will retrieve all the Windows Servers in the domain and export the disk drives to a CSV file.

C:\scripts\.\Get-DiskSpaceReport.ps1

Browse to C:\Temp\DiskSpaceReport and open the exported CSV file.

In this example, we did open the CSV file with Microsoft Excel.

Get free disk space for specific Windows Servers

Suppose you want to export the free disk space for specific Windows Servers. Instead of running the script against all the Windows systems in Active Directory, you can create and use a specific list as input.

Create a CSV file with the name ADComputers.csv in C:\Temp. Add the header Hostname and add the Windows Servers hostnames on each line.

In our example, we like to export the free disk space on two Windows Servers.

Run the script below to export the free disk space report for the specific Windows Servers to a CSV file.

Set-ExecutionPolicy Unrestricted -Force
Import-Module ActiveDirectory

# Delete reports older than 60 days
$OldReports = (Get-Date).AddDays(-60)

# Location for disk reports
Get-ChildItem "C:\Temp\DiskSpaceReport\*.*" |
Where-Object { $_.LastWriteTime -le $OldReports } |
Remove-Item -Recurse -Force -ErrorAction SilentlyContinue

# Create variable for log date
$LogDate = Get-Date -Format yyyyMMddhhmm

# Import CSV file
$Systems = Import-Csv "C:\Temp\ADComputers.csv"

# Loop through each server
$DiskReport = ForEach ($System in $Systems) {
    $ComputerName = $System.Hostname
    $OperatingSystem = (Get-ADComputer -Identity $ComputerName -Properties OperatingSystem).OperatingSystem
    $OperatingSystemVersion = (Get-ADComputer -Identity $ComputerName -Properties OperatingSystemVersion).OperatingSystemVersion
    Get-WmiObject Win32_LogicalDisk `
        -ComputerName $ComputerName -Filter "DriveType=3" `
        -ErrorAction SilentlyContinue |
    Select-Object `
    @{Label = "HostName"; Expression = { $_.SystemName } },
    @{Label = "DriveLetter"; Expression = { $_.DeviceID } },
    @{Label = "DriveName"; Expression = { $_.VolumeName } },
    @{Label = "Total Capacity (GB)"; Expression = { "{0:N1}" -f ($_.Size / 1gb) } },
    @{Label = "Free Space (GB)"; Expression = { "{0:N1}" -f ($_.Freespace / 1gb ) } },
    @{Label = 'Free Space (%)'; Expression = { "{0:P0}" -f ($_.Freespace / $_.Size) } },
    @{Label = "Operating System"; Expression = { $OperatingSystem } },
    @{Label = "Operating System Version"; Expression = { $OperatingSystemVersion } }
}

# Create disk report
$DiskReport |
Export-Csv -Path "C:\Temp\DiskSpaceReport\DiskReport_$LogDate.csv" -NoTypeInformation #-Delimiter ";"

Get free disk space for Windows clients

Get free disk disk space for Windows 10 clients.

If you want to check all the free disk space on Windows 10 clients, edit line 36 in the original PowerShell script to:

$Systems = Get-ADComputer -Properties * -Filter { OperatingSystem -like "*Windows 10*" } |

Get free disk space for Windows 11 clients.

If you want to check all the free disk space on Windows 10 clients, edit line 36 in the original PowerShell script to:

$Systems = Get-ADComputer -Properties * -Filter { OperatingSystem -like "*Windows 11*" } |

Run the PowerShell script and check the disk report CSV file with your favorite program. In this example, it’s the application Microsoft Excel.

It’s great to get all Windows disk sizes in the environment.

Note: Always use monitoring software on the systems to get an alert when the disk space is getting full. The script is not available to replace monitoring system software!

Read more: Convert thick provisioned disk to thin on VMware ESXi »

Conclusion

You learned how to check free disk space on Windows with PowerShell. Get domain-joined Windows Server, Windows 10, or Windows 11 clients in bulk and export the disk space in a report.

Use this script to check free disk space and create a report. For example, if you’re going to talk with the customer and explain why you need to buy more disks. Or what’s helpful is that you can see in the disk report how much free space is allocated on the systems, and maybe you don’t need it. This is a great way to adjust the disk volume sizes and don’t waste any extra free space.

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