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Storage Devices
Introduction ,[object Object]
Parts of a Computer ,[object Object],[object Object],[object Object],[object Object]
System Unit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Storage Devices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RAM ,[object Object],[object Object],[object Object],A form of data storage that can be accessed randomly at any time, in order and from any physical location DEFINITION ,[object Object],[object Object],[object Object],TYPES Allows the computer to read data quickly to run applications. USE
ROM ,[object Object],[object Object],A form of data storage that cannot be easily altered or reprogrammed. DEFINITION ,[object Object],[object Object],[object Object],[object Object],TYPES  Stores the program required to initially boot the computer USE
RAM vs ROM Data is safe when PC is switched off Data is lost when PC is switched off Information inside cannot be changed Data can be changed Stores information permanently Stores information temporarily Read Only Memory Random Access Memory ROM RAM
CD-ROM ,[object Object],[object Object],[object Object],[object Object]
Advantages and Disadvantages Fairly fast to access the data Slower to access than the hard disk Most computers can read CDs.  Smaller storage capacity than a hard drive or DVD Very cheap to produce Fairly fragile, easy to snap or scratch Small and portable Disadvantages Advantages
Hard Disk ,[object Object],[object Object],[object Object],[object Object],[object Object]
Advantages and Disadvantages It is fixed inside the computer and cannot easily be transferred to another computer Cheap on a cost per megabyte compared to other storage devices Regular crashes can damage the surface of the disk, leading to loss data in that sector Stored items are not lost when you switch off the computer Can crash which stop the computer from working Stores and retrieves data much faster than a floppy disk Far slower to access data than ROM and RAM chips Large storage capacity Disadvantages Advantages
Floppy Disk ,[object Object],[object Object],[object Object],[object Object]
Advantages and Disadvantages Many new computers don’t have floppy disk drives Small Storage capacity Can be used many times Can transport viruses from one machine to another Security tab to stop data from being written over Quite slow to access  and retrieve data Useful for transferring small files Data can be erased if the disk comes into contact with a magnetic field Inexpensive Not very strong - easy to damage Portable - small and lightweight Disadvantages Advantages
Flash Memory ,[object Object],[object Object],[object Object]
Advantages and Disadvantages Being developed with fashionable looking casing More reliable than floppy disk If handled roughly, it can be damaged  Hold more data than floppy disk or even a CD Can be easily be lost More compact, portable and cheap Disadvantages Advantages
BINARY CODE
Binary Codes ,[object Object],[object Object],[object Object]
Units Used A 1 or 0 (b) 1 bit 1 nybble (?) 4 bits 1 byte (B) 8 bits 1,125,899,906,842,624 bytes 1 petabyte (PB) 1,099,511,627,776 bytes 1 terabyte (TB) 1,073,741,824 bytes 1 gigabyte (GB) 1,048,576 bytes 1 megabyte (MB) 1,024 bytes 1 kilobyte (KB) Equivalent Unit
Bit and byte ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ASCII ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ASCII to binary Spare the jokes, when we enter a word example, “Computer”, it will program as: 0100001101101111011011010111000001110101011101000110010101110010 0111 0010 0101 0010 0110 0001 0100 0001 Binary ‘ r’ ‘ R’ ‘ a’ ‘ A’ ASCII
Now you try!! ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Storage devices

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  • 8. RAM vs ROM Data is safe when PC is switched off Data is lost when PC is switched off Information inside cannot be changed Data can be changed Stores information permanently Stores information temporarily Read Only Memory Random Access Memory ROM RAM
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  • 10. Advantages and Disadvantages Fairly fast to access the data Slower to access than the hard disk Most computers can read CDs. Smaller storage capacity than a hard drive or DVD Very cheap to produce Fairly fragile, easy to snap or scratch Small and portable Disadvantages Advantages
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  • 12. Advantages and Disadvantages It is fixed inside the computer and cannot easily be transferred to another computer Cheap on a cost per megabyte compared to other storage devices Regular crashes can damage the surface of the disk, leading to loss data in that sector Stored items are not lost when you switch off the computer Can crash which stop the computer from working Stores and retrieves data much faster than a floppy disk Far slower to access data than ROM and RAM chips Large storage capacity Disadvantages Advantages
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  • 14. Advantages and Disadvantages Many new computers don’t have floppy disk drives Small Storage capacity Can be used many times Can transport viruses from one machine to another Security tab to stop data from being written over Quite slow to access and retrieve data Useful for transferring small files Data can be erased if the disk comes into contact with a magnetic field Inexpensive Not very strong - easy to damage Portable - small and lightweight Disadvantages Advantages
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  • 16. Advantages and Disadvantages Being developed with fashionable looking casing More reliable than floppy disk If handled roughly, it can be damaged Hold more data than floppy disk or even a CD Can be easily be lost More compact, portable and cheap Disadvantages Advantages
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  • 19. Units Used A 1 or 0 (b) 1 bit 1 nybble (?) 4 bits 1 byte (B) 8 bits 1,125,899,906,842,624 bytes 1 petabyte (PB) 1,099,511,627,776 bytes 1 terabyte (TB) 1,073,741,824 bytes 1 gigabyte (GB) 1,048,576 bytes 1 megabyte (MB) 1,024 bytes 1 kilobyte (KB) Equivalent Unit
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  • 22. ASCII to binary Spare the jokes, when we enter a word example, “Computer”, it will program as: 0100001101101111011011010111000001110101011101000110010101110010 0111 0010 0101 0010 0110 0001 0100 0001 Binary ‘ r’ ‘ R’ ‘ a’ ‘ A’ ASCII
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