The first column, usually with a header according to the block size data, shows the total size of the disk.
第一列通常具有与块大小数据相对应的标题，它显示了磁盘的总大小。
A new block of the requested size is then allocated, the data is moved from the original block to the new block, and the new block is returned to the caller.
然后，按请求的大小分配一个新的块。把数据从原来的块转移到新的块中，把新的块返回给调用者。
If the needed size happens to be greater than the existing block, the block is freed, a new block is allocated from a new bucket, and the data is moved from the old block to the new block.
如果所需的大小大于现有的块，那么释放这个块，从另一个bucket分配一个新的块，把数据从原来的块转移到新的块中。
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