2. Excellence Publication Co. Ltd. Volume 1 2.61 Volume 1

3. Excellence Publication Co. Ltd. Volume 1 2.62 A. Magnetic Tape Drives  used to read data from and write data onto magnetic tapes  Two examples of magnetic tapes

4. Excellence Publication Co. Ltd. Volume 1 2.63 B. Floppy Disk Drives  used to read data from and write data onto magnetic disks Plastic Jacket Disk Sliding Metal Shutter Flexible Circle of Magnetic Material  storage capacity is 1.44MB

5. Excellence Publication Co. Ltd. Volume 1 2.64 C. Superfloppy Disk Drives  used to read data from and write data onto magnetic disks  the storage capacity of a superfloppy disk can be of hundreds of megabytes

6. Excellence Publication Co. Ltd. Volume 1 2.65 D. Optical Disk Drives  used to read data from and write data onto optical disks  Laser beam reflected at a land or pit  Laser beam encounters a transition

7. Excellence Publication Co. Ltd. Volume 1 2.66 Types of CDs and DVDs Features Audio CDs, CD-ROMs and DVD-ROMs CD-Recordables and DVD-Rs CD-Writables, DVD-RAMs and DVD-RWs Data is recorded at the time of manufacture and cannot be erased then. Data can be recorded in the user environment once and cannot be erased then. Data can be recorded again and again over in the user environment. Different Types of CDs and DVDs

8. Excellence Publication Co. Ltd. Volume 1 2.67 E. Magneto-optical (MO) Disk Drives  used to read data from and write data onto MO disks  a rewritable optical disk

9. Excellence Publication Co. Ltd. Volume 1 2.68 F. Hard Disk Drives  used to read data from and write data onto hard disks  there are two types of interfaces used by hard disk drives:  The Integrated Drive Electronics (IDE)  The Small Computer System Interface (SCSI)  hard disk drives are less portable than other storage devices

10. Excellence Publication Co. Ltd. Volume 1 2.69 Secondary Storage Devices Technique Type(s) Access Magnetic Optical Magnetic & Optical Magnetic Sequential Random Sequential/Random Random Magnetic Tape Drives Floppy Disk Drives Superfloppy Disk Drives Optical Disk Drives MO Disk Drives Hard Disk Drives The features of different secondary storage devices

11. Excellence Publication Co. Ltd. Volume 1 2.610 There are different types of secondary storage devices. Suggest two examples and compare their differences.

12. Excellence Publication Co. Ltd. Volume 1 2.611 Back