将相关数据紧密组织在一起，以最小化磁盘访问时间。
To organize related data close together to minimize disk access times.
因为系统管理员很少使用atime，禁用它可以减少磁盘访问时间。
Because atime is rarely used by systems administrators, disabling it frees up some disk time.
因此，与按顺序读取相比，按随机顺序读取数据时的磁盘访问时间要长得多。
As a result, the disk access time is much longer when reading data in random order than when reading in sequential order.
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