更重要的一点是，大面积数据的退化过程可能会毁掉小部分扇区的内容。
What's more, a decay process that would leave a large-scale bit of data readable could destroy some smaller-scale bits.
第一个扇区从引导设备上加载内核的其余部分继续引导过程。
This first sector will continue the boot process by loading the rest of the kernel from the boot device.
图1显示一个数据块(例如一个512字节的扇区)，末尾有8字节的附加部分。
Figure 1 shows a data block (for example, a 512 byte sector) with the 8-byte footer attached to the end.
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