Cannot create extended DOS partition without primary DOS partition on disk.
在盘中没有主dOS分区，故不能建立扩展分区。
This lesson will teach the disk operating system-DOS.
本期为第二讲，讲授磁盘操作系统——DOS。
This operating system was called Disk operating system or DOS.
这个操作系统后来就被叫做磁盘操作系统。
This operating system was called Disk operating system or DOS.
这个操作系统后来就被叫做磁盘操作系统。
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