They are separated by function and the length of time a computer needs to remember something. Equal to 1000 bytes or about a half page of text. Equal to One Million bytes. Equal to One Billion bytes. The hard drive and floppy disk, both provide long-term storage of files and programs.
RAM is short-term memory.
This is the memory that allows you to run your programs. The more RAM you have the more programs you can run at once or you will be able to run very large programs. It is built in long term memory and the size of your hard disk determines how much information can be saved on your computer. A large hard disk will allow you to install more applications. Floppy Drive - A floppy drive will store information onto a floppy disk.