GB is 1,000,000,000 bytes. A 100 MB zip disk hold the equivalent of 70 or 80 floppies. A box inside the computer that stores electronic data. The user has no access to it. It is closed and not visible from the outside.
Most computers have a light that tells when the hard drive is doing something.
The larger the number, the more data it holds. A device that sends and receives electronic data between computers. There are different kinds of modems. Telephone modems transfer data over telephone lines and work today at top speeds of 56,000 bits per second, although in Boulder City, anything over about 44,000 is exceptional due to distance from Vegas and poor connections. All new computers come with 56K modems.