This is all you have to know about these terms for this course. If you wish to read more about these types of storage, pages 180 through 190 goes into more detail. It is usually built in to the computer system but you can also buy external hard drives for additional high capacity storage. Manufacturers used to build internal drives for them into computer systems, but they have been replaced by CD ROM drives. Magnetic tape storage capacity is greater than floppy disk capacity but lower than hard disk capacity.
Tape storage is usually used for backup storage in case data is lost from the hard disk.
Take note that the term CD ROM stands for compact disk read-only memory. Initially, the manufacturer of CD ROMs had to use special equipment to write the data to CDs before they shipped them out. A CD-R is a computer CD that can be written to once. A CD-RW can be written to multiple times. DVDs are used to run full length movies with theater quality sound.