Memory Devices
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Prof.S.G.Isave,Assistant Professor,Tilak College of Education,Pune-India
Storage Devices
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Storage Devices
Primary Storage ROM ChipsRAM Chips
• Secondary Storage –• 1. Optical – • CD/DVD/BRD• 2. magnetic – • Pen Drive• Memory Card• Hard Disc
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Primary Storage Devices
• ROM –• Read Only Memory.• Permanent memory.• Non-volatile memory.• Can’t be edited.• Stores important
program from system software, regarding functioning of computer. (Booting)
• RAM – • Random Access
Memory.• Volatile memory.• Temporary memory.• Holds data up to saving.• Bring required
programs when user opens a file.
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Secondary Storage capacity
• Compact Disc – 700MB• Digital Versatile Disc – 4 to 8GB• Blue Ray Disc – 25 GB• Hard Disc – 5 to 500 GB• Pen Drive – 2 GB to 8GB +• Memory Card – 2GB to 8GB +
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OPTICAL DEVICES- CD/DVD/BRD
Type Write Edit Re burn
R- Recordable Yes No Limited
RW- Rewritable. Yes Yes Yes
ROM – Read Only Memory.
No No No
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MAGNETIC Devices
Type Write Edit Reuse
Hard disc Yes Yes Yes
Pen Drive Yes Yes Yes
Memory Card Yes Yes Yes
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Use of Optical Devices
• CD/DVD/BRD (R) – To store data permanently.
• CD/DVD/BRD (RW) – to store data temporarily, to carry data.
• CD/DVD/BRD (ROM) – software, educational program, movies, drivers, games etc.
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Use of Magnetic Devices
• Hard disc – Essential part of a computer.• Useful to store system, all application software,
drivers, data and information.
• Mass Storage Devices – • To carry data.• To store data temporarily.• Can carry all type of data i.e. software, music,
video file, presentation, images, photos