These steps describe the full block format, in which all lines start at the left.
这些步骤描绘了主题结构的格式，所有文字行都从左边开始。
But since XML documents are broken at arbitrary positions in the block-level format, it is necessary to record a stack of open elements where a block begins.
但因为XML文档在块级别格式中是从任意位置断开的，因此有必要记录打开元素(块在其中开始)的堆栈。
In practice, however, the physical block size information is spurious, at least for the first generation of Western Digital Advanced format drives.
但是在实践中，物理块大小信息是假的，至少对于第一代Western Digital Advanced Format驱动是这样的。
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