Chapter 3Storage DeviceChapter 3Storage Device

3.1 Main Memory

3.2 Secondary Storage

3.1 Main Memory

3.2 Secondary Storage

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3.1Main Memory3.1Main Memory

Try to point out Random Access Memory (RAM), floppy disk drive, CR-ROM drives and hard disk drives in the following diagram

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3.1Main Memory3.1Main Memory

Read-Only Memory (ROM)

Motherboard

ROM chip

BIOS Setting screen

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3.1Main Memory3.1Main Memory

Random Access Memory (RAM)

RAM modules

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3.1Main Memory3.1Main Memory

Differences between ROM and RAM

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Floppy Disk and Floppy Disk Drive

Hard Disk Drive

3.2 Secondary Storage3.2 Secondary Storage

Floppy disk Floppy

disk drive

LS-120Zip

Hard disk drive

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3.2 Secondary Storage3.2 Secondary Storage

CD-ROM and CD-ROM Drive

CR-ROM drive

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3.2 Secondary Storage3.2 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

3.3 KB,MB,GB,TB, …3.3 KB,MB,GB,TB, …

Unit Approximate value Actual Value1 KB 1,000 B 1,024 B1 MB (= 1024 KB) 1,000,000 B 1,048,576 B1 GB (= 1024 MB) 1,000,000,000 B 1,073,741,824 B1 TB (= 1024 GB) 1,000,000,000,000 B 1,099,511,627,776 B

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1 B = 1Byte

1b = 1 bit

1B (Byte) = 8b (bit)

1 bit is the smallest unit of data in computer system.

CalculationCalculation

374,784,000

1024 * 1024

= 357.421875 MB

357MB

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3.4 Common capacities3.4 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

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KeywordsKeywords

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)

Chapter 3Storage Device

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Chapter 3Storage Device

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