function IsDriveReady(Root: string): Boolean;
var
Oem: Cardinal;
Dw1, Dw2: DWORD;
begin
Oem := SetErrorMode(SEM_FAILCRITICALERRORS);
if Length(Root) = 1 then Root := Root + ':\';
Result := GetVolumeInformation(PChar(Root), nil, 0, nil, Dw1, Dw2, nil, 0);
SetErrorMode(Oem);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if IsDriveReady('A') = True then
ShowMessage('Drive ready !')
else
ShowMessage('Drive not ready !');
end;
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