That’s because you can’t directly boot from anywhere inside an extended partition.
因为你不能从扩展分区启动系统。
The partition table is located in the master boot record (MBR) of a disk.
分区表位于磁盘主引导记录（MBR）之中。
If you have a PReP boot partition, use it.
如果有一个PReP引导分区，则请使用它。
If you have a PReP boot partition, use it.
如果有一个PReP引导分区，则请使用它。
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