They are used for backing up large amounts of data or for additional storage capacity. 他们用来储存大数量的数据或者当作额外的存储容量。
Continuing up the size scale,the mainframe computer is one that may offer a faster processing speed and a greater storage capacity than a typical mini. 随着规模的增加，形成了大型计算机，它比一般的小型计算机有更快的处理速度和更大的存储容量。
