卸载一个假忙的硬盘

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  1. df -h查看卸载硬盘信息

  2. umount /dev/sdf，停止使用的硬盘假装忙碌状态

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    umount: /mnt/usbhd2: device is busy.
            (In some cases useful info about processes that use
             the device is found by lsof(8) or fuser(1))

  3. fuser /dev/sdf，查看占用硬盘的进程

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    /mnt/sdf:         106657c

  4. kill -9 106657

  5. 重新执行umount /dev/sdf

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