USBメモリのドライブ名を取得する方法 (ID:47667)

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ということでtakeさん、Delphi版が出来ましたのでお試しください。
なお、タイプライブラリ WbemScripting_TLB は使用してません。（使うとかえって面倒なので。）

下記サンプルの出力例
USB Drives:
F:
G:
USB Drives Supports Removable Media:
G:
IDE Drives:
C:
E:

☆InterfaceTypeとかCapabilitiesの定数はこちら
Win32_DiskDrive class (Windows)
http://msdn.microsoft.com/en-us/library/aa394132%28v=vs.85%29.aspx

WQL (SQL for WMI) (Windows)
http://msdn.microsoft.com/en-us/library/aa394606%28v=vs.85%29.aspx

implementation

{$R *.dfm}

uses
  ComObj, ActiveX;

// Win32_DiskDrive.InterfaceType  'SCSI', 'HDC', 'IDE', 'USB', '1394'
function GetDriveNamesByType(DriveNames: TStrings; InterfaceType: String;
  OnlyRemovable: Boolean): Boolean;
var
  WMI: OleVariant;
  Query: String;
  DiskDrives,  DiskPartitions, LogicalDisks: OleVariant;
  DiskDrivesEnum, DiskPartitionsEnum, LogicalDisksEnum: IEnumVariant;
  DiskDrive, DiskPartition, LogicalDisk: OleVariant;
  iValue : LongWord;
  strDeviceID: String;
  I: Integer;
begin
  Result:=False;

WMI:=OleVariant(CreateOleObject('WbemScripting.SWbemLocator')).ConnectServer;

Query:='SELECT * FROM Win32_DiskDrive WHERE InterfaceType='''+InterfaceType+'''';
  DiskDrives:=WMI.ExecQuery(Query);

DiskDrivesEnum:=IUnknown(DiskDrives._NewEnum) as IEnumVariant;
  while DiskDrivesEnum.Next(1, DiskDrive, iValue)=0 do begin

if OnlyRemovable then begin
      for I:=VarArrayLowBound(DiskDrive.Capabilities, 1) to VarArrayHighBound(DiskDrive.Capabilities, 1) do begin
        if DiskDrive.Capabilities[I]=7 then Break; // 7: Supports Removable Media
      end;
      if I=VarArrayHighBound(DiskDrive.Capabilities, 1)+1 then Continue;
    end;

strDeviceID:=StringReplace(VarToStr(DiskDrive.DeviceID), '\', '\\', [rfReplaceAll]);
    Query:='ASSOCIATORS OF {Win32_DiskDrive.DeviceID="'+strDeviceID+
           '"} WHERE AssocClass=Win32_DiskDriveToDiskPartition';
    DiskPartitions:=WMI.ExecQuery(Query);

DiskPartitionsEnum:=IUnknown(DiskPartitions._NewEnum) as IEnumVariant;
    while DiskPartitionsEnum.Next(1, DiskPartition, iValue)=0 do begin
      Query:='ASSOCIATORS OF {Win32_DiskPartition.DeviceID="'+
             VarToStr(DiskPartition.DeviceID)+
             '"} WHERE AssocClass=Win32_LogicalDiskToPartition';
      LogicalDisks:=WMI.ExecQuery(Query);

LogicalDisksEnum:=IUnknown(LogicalDisks._NewEnum) as IEnumVariant;
      while LogicalDisksEnum.Next(1, LogicalDisk, iValue)=0 do begin
        strDeviceID:=VarToStr(LogicalDisk.DeviceID);
        if strDeviceID<>'' then begin
          DriveNames.Add(strDeviceID);
          Result:=True;
        end;
      end;
      LogicalDisks:=Unassigned;

end;
    DiskPartitions:=Unassigned;

end;
  DiskDrives:=Unassigned;
  WMI:=Unassigned;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Lines.Add('USB Drives:');
  GetDriveNamesByType(Memo1.Lines, 'USB', False);
  Memo1.Lines.Add('USB Drives Supports Removable Media:');
  GetDriveNamesByType(Memo1.Lines, 'usb', True);
  Memo1.Lines.Add('IDE Drives:');
  GetDriveNamesByType(Memo1.Lines, 'IDE', False);
end;

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