1. Chapter 3 Storage Device 3.1 Main Memory 3.2 Secondary Storage 3.1 Main Memory 3.2 Secondary Storage

2. Page 2© DVEP 2003 3.1Main Memory Try to point out Random Access Memory (RAM), floppy disk drive, CR-ROM drives and hard disk drives in the following diagram

3. Page 3© DVEP 2003 3.1Main Memory Read-Only Memory (ROM) Motherboard ROM chip BIOS Setting screen

4. Page 4© DVEP 2003 3.1Main Memory Random Access Memory (RAM) RAM modules

5. Page 5© DVEP 2003 3.1Main Memory Differences between ROM and RAM

6. Page 6© DVEP 2003 Floppy Disk and Floppy Disk Drive Hard Disk Drive 3.2 Secondary Storage Floppy disk Floppy disk drive LS-120 Zip Hard disk drive

7. Page 7© DVEP 2003 3.2 Secondary Storage CD-ROM and CD-ROM Drive CR-ROM drive

8. Page 8© DVEP 2003 3.2 Secondary Storage Memory Card and Reader ‧ All-in-one memory card reader ‧ CompactFlash card ‧ SmartMedia card ‧ Memory Stick card ‧ Secure Digital card ‧ eXtreme Digital card ‧ Microdrive ‧ USB flash storage / USB thumb drive ‧ Magnetic tape drive ‧ Mini DV tape

9. 3.3 KB,MB,GB,TB, … UnitApproximate valueActual Value 1 KB1,000 B1,024 B 1 MB (= 1024 KB)1,000,000 B1,048,576 B 1 GB (= 1024 MB)1,000,000,000 B1,073,741,824 B 1 TB (= 1024 GB)1,000,000,000,000 B1,099,511,627,776 B Page 9© DVEP 2003 1 B = 1Byte 1b = 1 bit 1B (Byte) = 8b (bit) 1 bit is the smallest unit of data in computer system.

10. Calculation 374,784,000 1024 * 1024 = 357.421875 MB 357MB Page 10© DVEP 2003

11. 3.4 Common capacities CD 650MB (normal; max 800MB) DVD 4.7GB Harddisks 160GB – 2TB (2048GB) Memory Cards / USB Thumb drives 1GB – 32GB Floppy disks 1.44MB Page 11© DVEP 2003

12. Page 12© DVEP 2003 Keywords 唯讀光碟 CD Read-Only Memory (CD-ROM) 可燒錄光碟 CD-Recordable (CD-R) 可重複讀寫光碟 CD-Rewritable (CD-RW) 光碟機 CD drive 光碟燒錄機 CD writer 字節 / 位元組 Byte 位元 bit 基本輸入輸出系統 Basic Input/Output System (BIOS) 唯讀記憶體 Read-Only Memory (ROM) 開機自我檢測 Power-On Self Test (POST) 數位影音光碟 Digital Video Disk (DVD) 隨機存取記憶體 Random Access Memory (RAM)

13. Chapter 3 Storage Device -End-