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Chapter 3Storage DeviceChapter 3Storage Device
3.1 Main Memory
3.2 Secondary Storage
3.1 Main Memory
3.2 Secondary Storage
Page 2© DVEP 2003
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
Page 3© DVEP 2003
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
Page 8© DVEP 2003
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
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.
CalculationCalculation
374,784,000
1024 * 1024
= 357.421875 MB
357MB
Page 10© DVEP 2003
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
Page 11© DVEP 2003
Page 12© DVEP 2003
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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