buffer storage device

基本解释

The physical layer transfers content from the buffer to the storage device.
物理层将内容从缓冲区传输到存储设备。
The logical layer allocates a buffer to use to write data to a storage device. The physical layer manages access to the storage device.
逻辑层分配了一个用来写数据到存储设备的缓冲区，物理层管理对存储设备的访问。
Note that you can use the sync command to flush the buffer cache out to the storage media (force all unwritten data out to the device drivers and, subsequently, to the storage device).
注意，可以使用 sync 命令将缓冲区缓存中的请求发送到存储媒体（迫使所有未写的数据发送到设备驱动程序，进而发送到存储设备）。