- External hard disks can be purchased alone and then attached to the microcomputer with cables; they are used for backing up large amounts of data or for additional storage capacity.
内部硬盘永久性地安置在微机内，只有需维修或更换时才取出。外部硬盘可以独立购买，通过电缆线与微机相连。
- A unit of storage capacity equal to1,048,576(220) bytes.
百万字节(计算机)内存量的单位，相当于1,048, 576(220)个字节
- Hard disks provide tremendous storage capacities ranging from hundreds of megabytes to several gigabytes.
它的用处是备份大量的数据或增加存储容量。硬盘的存储容量从几百兆字节不等。
