Complete The Following Sentences:

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El-Shorouk Academy Higher Institute for Computer & Information Technology Department of Computer Science Acad. Year : 2011/ 2012 Term : First Year : First Course : Introduction in English Unit (12) Sheet -12- Complete the following sentences:1. CD stands for .....Compact Disc..... 2. CD-ROM stands for .....Compact Disc-Read Only Memory...... 3. CD-R stands for .....Compact Disc-Recordable...... 4. CD-RW stands for .....Compact Disc-ReWritable...... 5. DVD stands for ....Digital Versatile Disc....... 6. DVD-ROM stands for .....Digital Versatile Disc-Read Only Memory...... 7. MO drive stands for .....Magneto-Optical drive...... 8. DAT stands for ......Digital Audio Tape....... 9. WORM stands for ......Write Once, Read Many....... 10. One ......CD-ROM disc...... is equivalent to 500 floppies. 11. One DVD-ROM disk is equivalent to 25 times of ....an CD-ROM disc...... Read these sentences and decide if they are true (T) or false (F) and correct the wrong ones:1. Magnetic disks can store information at much higher densities than optical disks.(F) AnswerOptical disks can store information at much higher densities than magnetic disks. 2. Optical drives are slower than hard drives.(T) 3. CD-ROM drives can't play audio CDs.(F) AnswerCD-ROM drives can play audio CDs. Page 1 of 3 4. CD-RW disks are the modern version of old WORM disks.(F) AnswerCD-R disks are the modern version of old WORM disks. 5. Magneto-optical drives use both a laser and an electromagnet to record information.(T) 6. MO disks are read only disks.(F) AnswerMO disks are rewritable disks. 7. DVD-ROM drives can't play music CDs.(F) AnswerDVD-ROM drives can play music CDs. 8. A typical CD-ROM can hold up to 100 MB.(F) AnswerA typical CD-ROM can hold up to 650 MB. 9. You need a hard disk drive to read CD-ROM disks.(F) AnswerYou need a CD-ROM drive(or DVD-ROM drive) to read CD-ROM disks. 10. The data on a CD-ROM can be changed or written to.(F) AnswerThe data on a CD-ROM is a read-only data. 11. A CD-ROM is a good way of storing large amounts of information (images, sounds and applications).(T) 12. CD-R disks are used to backup hard disks or to archive information.(T) 13. A DVD-ROM can hold 17 GB.(T) 14. A CD-ROM disk is very different from a compact music disk.(F) AnswerA CD-ROM disk is the same as a compact music disk. 15. The data on a CD-ROM is read with a laser beam.(T)  Compare between the various types of optical drives (CD-ROM, CDRecorder, DVD and Magneto-Optical). CD-ROM Technical specifications Use  CD-ROM stands for Compact Disc-Read Only Memory.  CD-ROM systems offer everything, from shareware programs to dictionaries and encyclopedias, from multimedia databases to 3-D games.  One CD-ROM disk can hold up to 650 MB.  CD-ROM drives can play music Page 2 of 3 CDs while you work.  CD-ROM disk is a read-only disk that we can't write anything onto it. CD-Recorder  It comes on two different forms: CD-R and CD-RW.  CD-R stands for Compact DiscRecorder.  CD-R disks are the modern version of old WORM (Write Once, Read Many) disks.  ACD-R can be used to back up hard disks or to distribute and archive information.  A CD-RW can be used to save, update, delete and retrieve any data.  CD-RW stands for Compact DiscReWritable  CD-RW disks can be erased and re-used. DVD  It stands for Digital Versatile Disc.  It can hold 17 GB, bout 25 times a CD-ROM.  It can store a large amount of multimedia software.  DVD-ROMs are read-only devices that we can't write anything onto it.  DVD-ROM can play music CDs and CD-ROMs.  Companies also produced DVD-R and DVD-RW. Magneto-optical  MO drives use both a laser and an electromagnet to record information.  MO disks are rewritable that they can be written to, erased, and then written again.  It comes in two formats: (a) 5.25" cartridges can hold more than 5.2 GB. (b) 3.5" floptical disks have a capacity of 230 MB to 1.3 GB. Page 3 of 3  They are ideal for back-up and portable mass storage.