RDBMS designers concentrated on optimizing I/O and tried to align the data access patterns with the block structure imposed by the drives.

RDBMS 设计者的精力主要集中于优化 I/O 和设法用驱动器的块结构来安排数据访问模式。

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In this format each typed element - except the date and the signature block - begins at the left-hand margin. The date may be backspaced from the right margin point to align at the right margin;

这种格式下，书信的排版，除了日期和签名部分，都从左边空白处开始，没有空格，段段之间空行。

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