function write(blobObject) {
    t0 = performance.now();
    var path = cordova.file.externalApplicationStorageDirectory;
    window.resolveLocalFileSystemURL(path, function (directoryEntry) {
        directoryEntry.getFile('toto.iso', { create: true, exclusive: false }, function (fileEntry) {
            fileEntry.createWriter(function (fileWriter) {
                var writed_size = 0;
                var chunk_size = 0.25*1024*1024;

                var writeChunk = () => {
                    fileWriter.onwrite = function() {
                        if (writed_size < blobObject.size) {
                              writeChunk();
                        }
                        else {
                            t1 = performance.now();
                        }
                    };

                    if (writed_size) {
                        fileWriter.seek(fileWriter.length);
                    }

                    var seeked_data = blobObject.slice(writed_size, writed_size + Math.min(chunk_size, blobObject.size - writed_size));

                    fileWriter.write(seeked_data);
                    writed_size += Math.min(chunk_size, blobObject.size - writed_size);
                }

                writeChunk();
            });
        }, function() {alert('error');});
    });
}