A ______ infected computer may lose its data.

单项选择题As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called ______.

单项选择题The basic unit of measure in a computer system is the ______. It is the smallest unit in computing. There are some other measures in a computer, such as Kilobyte, Megabyte, Gigabyte and so on.