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块设备字符设备-jeenful的博客
source link: http://blog.51cto.com/2685141/2073719
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设备文件：设备访问入口 块设备：随机访问，数据块 字符设备：线性访问，按字符为单位 设备号：主设备号（major）和次设备号（minor）
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