The size of a data block in bucket is decided by the space
volume of various types of data files and the disk space of
the entire game. In principle, each data file can be
encapsulated in one data block. According to statistics
information of the related pictures, voice and movement
files, they has the size likely in the same order of magnitude
and we set the data block sizes to 105K, 1.6M and 310K for
picture, voice and movement catalog individually and the
required hard disk space is estimated about 2G.