注意到我们没有指明设备节点名字，于是udev使用了缺省名字。

Note that we did not specify a device node name, so udev uses the default.

youdao

上面规则意思是：匹配一个内核命名为hdb以及驱动为ide-disk的设备，命名设备节点为缺省名字,同时创建一个指向它的名为sparedisk的符号链接。

The above rule says: match a device which was named by the kernel as hdb AND where the driver is ide-disk. Name the device node with the default name and create a symbolic link to it named sparedisk.

youdao