Get-Drives.ps1

param (
    [Parameter(Mandatory = $false)]
    [string] $ComputerName = 'localhost',
    [Parameter(Mandatory = $false)]
    [String] $JsonUser
)

$parms = @{
    ComputerName = $ComputerName
    ErrorAction = "Stop"
}

if ( ! [string]::IsNullOrEmpty($JsonUser) ) {
    $hash = $JsonUser | ConvertFrom-Json
    $hash.pass = $hash.pass | ConvertTo-SecureString
    $parms.Credential = [PSCredential]::new($hash.user, $hash.pass)
}

try {
    $out = Invoke-Command @parms {
        [System.IO.DriveInfo]::GetDrives() |
        Where-Object {$_.TotalSize} |
        Select-Object   @{Name='Name';     Expr={$_.Name}},
                        @{Name='Label';    Expr={$_.VolumeLabel}},
                        @{Name='Size(GB)'; Expr={[int32]($_.TotalSize / 1GB)}},
                        @{Name='Free(GB)'; Expr={[int32]($_.AvailableFreeSpace / 1GB)}},
                        @{Name='Free(%)';  Expr={[math]::Round($_.AvailableFreeSpace / $_.TotalSize,2)*100}},
                        @{Name='Format';   Expr={$_.DriveFormat}},
                        @{Name='Type';     Expr={[string]$_.DriveType}}
    } | Select-Object * -ExcludeProperty PSComputerName, RunspaceId, PSShowComputerName
} catch [System.Management.Automation.RuntimeException] {
    $myError = @{
        Message = $_.Exception.Message
        Type = $_.FullyQualifiedErrorID
    }
    $out = @{ Error = $myError }
}

ConvertTo-Json $out -Compress