Linux中mtd子系统的主要目标是在系统的硬件驱动程序和上层，或用户模块之间提供通用接口。
The main aim of the MTD subsystem in Linux is to provide a generic interface between the hardware drivers and the upper layers, or user modules, of the system.
每个LLD都提供了到特定底层硬件的接口，但所使用的到中间层的接口却是一组标准接口。
Each LLD provides the interface to the particular underlying hardware but USES the standard set of interfaces to the mid layer.
操作系统的目的之一就是把底层硬件的特性给封装起来，然后提供一个统一的接口，以便于计算机操作人员控制硬件。
The purpose of the OS is to encapsulate all the intricacies of the underlying hardware and provide a unified access interface to the computer's parts. No application can access the hardware directly.
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