نقل قول:function GetHardDiskPartitionType(const DriveLetter: Char): string;
var
NotUsed: DWORD;
VolumeFlags: DWORD;
VolumeInfo: array[0..MAX_PATH] of Char;
VolumeSerialNumber: DWORD;
PartitionType: array[0..32] of Char;
begin
GetVolumeInformation(PChar(DriveLetter + ':\'),
nil, SizeOf(VolumeInfo), @VolumeSerialNumber, NotUsed,
VolumeFlags, PartitionType, 32);
Result := PartitionType;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(GetHardDiskPartitionType('c'));
ShowMessage(GetHardDiskPartitionType('a'));
end;