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Our Lady of the Rosary College 2006-2007 S.2 Computer Literacy

Our Lady of the Rosary College 2006-2007 S.2 Computer Literacy. Lesson 8 Storage Unit Mr. Ku Heung Chin. 0100 0001. A. 0100 0101. E. 0100 0010. B. 0100 0110. F. 0100 0011. C. 0100 0111. G. 0100 0100. D. 0100 1000. H. The unit of memory.

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Our Lady of the Rosary College 2006-2007 S.2 Computer Literacy

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  1. Our Lady of the Rosary College2006-2007 S.2 Computer Literacy Lesson 8 Storage Unit Mr. Ku Heung Chin

  2. 0100 0001 A 0100 0101 E 0100 0010 B 0100 0110 F 0100 0011 C 0100 0111 G 0100 0100 D 0100 1000 H The unit of memory • How does computer store the character ‘A’? • Computer can only ‘read’ binary digit (0 or 1). • Computer will change a character into 8 binary digit, • e.g. A:0100 0001 • The coding standard is ASCII.

  3. Bits and Bytes • Each binary digit is 1 bit • How many bits in one character? • Ans: 8 bits • Each character need 1 Byte of memory. • How many bits in 1 Byte? • Ans: 8 bits

  4. KB / MB / GB / TB

  5. Main Memory • It stores data and instruction to be executed by the CPU. • Random Access Memory (RAM) • Read Only Memory (ROM)

  6. RAM vs ROM

  7. Secondary storage • Magnetic storage devices • Floppy disk drive • Hard disk • Optical storage devices • CD-ROM • CD-RW • DVD-ROM • DVD-RW

  8. Floppy Disk Drive • Small capacity.(1.2MB / 1.44MB) • Read/write speed is very slow.

  9. Hard Disk • High capacity (80 GB ~ 500 GB) • Fastest processing speed. • http://www.youtube.com/watch?v=9eMWG3fwiEU&eurl

  10. CD-ROM / CD-RW • Compact Disc Read-Only Memory. • 650 MB ~ 800MB • Can write only once • Compact Disc Re-Writable • can re-write data for many times

  11. DVD / DVD-RW • Digital Versatile Disc / Digital Video Disc • 4.7GB – 8.5GB

  12. Main Memory vs Secondary Storage

  13. Other Storage Devices • Memory Cards • Smart Media (SM) • Compact Flash (CF) • Secure Digital Card (SD) • Memory Stick (MS) • xD-Picture Card (XD)

  14. The End Thanks for coming!!

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