code: function Code( buffer, start, end ) {
  
    if( !(this instanceof Code) )
      return new Code( buffer, start, end )
  
    this.offset = start || 0x00
  
    if( Buffer.isBuffer( buffer ) ) {
      this.data = buffer.slice( start, end )
    } else {
      this.data = Buffer.alloc( 446 )
    }
  
  }
docs: Code section structure
  @class
  @memberOf MBR
  @param {Buffer} buffer
  @param {Number} [start]
  @param {Number} [end]