检查磁盘容量。了解系统信息，有助于我们深刻了解计算机的状态，方便开发与维护．-check disk capacity. Understanding of system information, help us understand the profound state of the computer, facilitate the development and maintenance.

E820 Address Map描述(用C与Assembly混编) OS必须知道系统物理内存的数量，才能够有效的使用和管理这些物理内存。所以在booting阶段，我们必须通过某种手段来检测和获取物理内存的总量。因此我们利用BIOS中断获取内存容量，常用的是INT 15h, AX=E820h - Query System Address Map的中断方法 ,E820 Address Map describe (using C and Assembly mixed) OS system must

用以查找Windows系统中硬盘的型号、容量等相关信息。-Look for Windows system hard drive model, capacity and other relevant information.