A. Input b. Retrieve c. Attach d. Store

20. The user can’t change what is ….. on WORM disks.

A. Imprinted B. Read

C. Sealed D. Spinned

21. Hard disks are …….. by magnetic fields.

A. Written B. Attached

C. Affected D. Surrounded

22. If the hard disk is considered ‘internal’, it means that it is ……into the computer.

A. Attached b. Sealed c. Imprinted d. Spinned

23. CD-ROM drives are …….. then hard drives.

A. Faster b. Slower

24. Floppy and hard types of disks work …...

A. In the same way B. In quite different ways

C. Slightly different

25. Erasable optical disks are mainly used as ……..

A. Secondary storage devices B. Backing store