说明：  Delphi获取电脑里各个磁盘的容量，包括硬盘和USB设备、TF卡等设备的容量，并以柱状图的形式显示出来，可显示磁盘的总容量大小，剩余可用空间的大小，本源码除了学习到如何使用Delphi获取磁盘容量外，还可以学习一下柱状图是如何使用的，比较基础的实用技巧，或许Delphi新手朋友们比较喜欢。
(Delphi for computer disk capacity, including the capacity of the hard disk and USB devices, TF card and other equipment, and a histogram display, can display the total size of the disk, the size of the remaining free space, the source in addition to learning to how to use Delphi for disk capacity, you can also learn about the histogram is how to use the basic practical skills, perhaps Delphi novice friends like.)