public void erase(){
  byte[] bytes=null;
  for (  ByteBuffer buffer : buffers) {
    if (bytes == null || bytes.length < buffer.limit())     bytes=new byte[buffer.limit()];
    buffer.position(0);
    buffer.put(bytes,0,buffer.limit());
    buffer.position(0);
  }
}

public void erase ( ) { byte [ ] bytes = null ; for ( ByteBuffer buffer : buffers ) { if ( bytes == null || bytes . length < buffer . limit ( ) ) bytes = new byte [ buffer . limit ( ) ] ; buffer . position ( 0 ) ; buffer . put ( bytes , 0 , buffer . limit ( ) ) ; buffer . position ( 0 ) ; } }
erase file by setting all bytes to 0
