Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  Adds all fixed drives into Combobox1. 
  To enumerate another type of drive, 
  i.e all CD-ROMs just change the DRIVE_FIXED constant to DRIVE_CDROM. 

  Fugt all fixen Laufwerke in Combobox1 ein. 
  Um z.B alle CD-Rom Laufwerke zu ermitteln, 
  einfach DRIVE_CDROM anstatt die Konstante DRIVE_FIXED nehmen. 
}

 procedure List_Drives;
 const
   DRIVE_UNKNOWN = 0;
   DRIVE_NO_ROOT_DIR = 1;
   DRIVE_REMOVABLE = 2;
   DRIVE_FIXED = 3;
   DRIVE_REMOTE = 4;
   DRIVE_CDROM = 5;
   DRIVE_RAMDISK = 6;
 var
   r: LongWord;
   Drives: array[0..128] of char;
   pDrive: PChar;
 begin
   r := GetLogicalDriveStrings(SizeOf(Drives), Drives);
   if r = 0 then Exit;
   if r > SizeOf(Drives) then
     raise Exception.Create(SysErrorMessage(ERROR_OUTOFMEMORY));
   pDrive := Drives;
   while pDrive^ <> #0 do
   begin
     if GetDriveType(pDrive) = DRIVE_FIXED then
       Form1.ComboBox1.Items.Add(pDrive);
     Inc(pDrive, 4);
   end;
 end;