这允许显示工具提示，即当鼠标悬停在扇形图的某个扇区上时显示的一些额外文本。
This allows for a tool tip, which is some extra text to be shown when a slice of the pie is moused over.
仔细查看，就会发现硬盘事实上在扇区之间包括大量额外数据，这些额外字节由磁盘固件使用，以检测和纠正每个扇区内的错误。
When you look closer, hard disks actually include a great deal of extra data in between sectors. These extra bytes are used by the disk's firmware to detect and correct errors within each sector.
扇区包含用户数据和额外开销数据，例如已依据扇区的用户数据计算的错误校正码(ECC)。
A sector includes user data and overhead data, such as an Error Correction Code (ECC) that has been calculated from the user data of the sector.
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