* @throws UnsupportedFormatException
*/
public VMWareDisk(File file) throws IOException, UnsupportedFormatException {
FileDescriptor fd = IOUtils.readFileDescriptor(file);
ExtentFactory factory = fd.getExtentFactory();
this.handler = factory.createIOHandler(fd);
this.descriptor = fd.getDescriptor();
this.length = handler.getNbSectors() * IOHandler.SECTOR_SIZE;
LOG.debug("handler for file " + file.getName() + " : " + handler.getClass().getName());
}