drives existentes

  unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  DriveNum: Integer;
  DriveChar: Char;
  DriveBits: set of 0..25;
  DriveType: Integer;
begin
  Integer(DriveBits) := GetLogicalDrives;
  for DriveNum := 0 to 25 do
  begin
    if not (DriveNum in DriveBits) then
    begin
      Continue;
    end;
    DriveChar := UpCase(Char(DriveNum + Ord('a')));
    DriveType := GetDriveType(PChar(DriveChar +':\'));
    case DriveType of
      DRIVE_REMOVABLE: ListBox1.Items.Add(DriveChar + ': Disco Flexível');
      DRIVE_FIXED: ListBox1.Items.Add(DriveChar + ': Disco Fixo');
      DRIVE_REMOTE: ListBox1.Items.Add(DriveChar + ': Network Volume');
      DRIVE_CDROM: ListBox1.Items.Add(DriveChar + ': CD-ROM');
      DRIVE_RAMDISK: ListBox1.Items.Add(DriveChar + ': RAM');
    end;
  end;
end;

end.