IT Toolbox
IT Toolbox

Check available disk space on Windows

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Check available disk space on Windows

Lists local volumes and calculates their occupancy rate to quickly identify a saturated disk.

Command / script 
Get-Volume | Where-Object DriveLetter | ForEach-Object {
    $Used = $_.Size - $_.SizeRemaining
    [PSCustomObject]@{
        Lecteur       = $_.DriveLetter
        Name           = $_.FileSystemLabel
        Taille_Go     = [math]::Round($_.Size / 1GB, 1)
        Utilise_Go    = [math]::Round($Used / 1GB, 1)
        Libre_Go      = [math]::Round($_.SizeRemaining / 1GB, 1)
        Occupation_Pc = if ($_.Size) { [math]::Round(($Used / $_.Size) * 100, 1) } else { 0 }
    }
} | Sort-Object Occupation_Pc -Descending | Format-Table -AutoSize

When should you use it?

Run this before an update, when a server becomes slow, or when a backup fails because of insufficient space.

What the script does

  • The command calculates used space from total capacity and remaining free space.
  • The fullest volumes are displayed first.

Precautions

  • This command does not delete any files.
  • A volume above 90% usage usually deserves further investigation.

Rollback

No rollback is required.

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