its describe about the all details of computer memory

1. PRESTIGE
INSTITUTE OF MANAGEMENT
GWALIOR
PRESENTED BY :
Satish Gupta &
Saurabh Soni
PRESENTED TO :
PROF . RAM PALIWAL

2. COMPUTER
MEMORY
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3. WHAT IS
MEMORY?The Computer Memory is a temporary storage area. It
holds the data and instructions that the Central
Processing Unit (CPU) needs. Before a program can be
run, the program is loaded from some storage medium
into the memory. This allows the CPU direct access to
the program. Memory is a need for any computer.
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There are two kinds of computer memory:
Primary and Secondary.

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5. PRIMARY MEMORY
 These are semiconductor memories
 It is known as main memory.
 Usually volatile memory.
 Data is lost in case power is switched
off.
 It is working memory of the computer.
 Faster than secondary memories.
 A computer cannot run without primary
memory.
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6. TYPES OF PRIMARY
MEMORY
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7. RAM(Random Access Memory)
 RAM stands for Random Access Memory.
 It is the internal memory of the CPU for
storing data, program and program result.
 It is read/write memory.
 This is a temporary or volatile memory.
 As soon as the machine is switched off, data is
erased.
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8. Types of RAM
RAM is of two types
 Static RAM (SRAM)
 Dynamic RAM
(DRAM)
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9. SRAM(Static Ram)
 It has long life.
 Faster.
 Used as cache memory.
 Large size.
 Expensive.
 High power consumption.
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10. DRAM(Dynamic Ram)
 Used as RAM.
 Need to be refreshed continuously.
 Slower as compared to SRAM.
 Lesser in size.
 Less expensive.
 Less power consumption.
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11. ROM(Read only memory)
 ROM stands for Read Only Memory.
 It is a read-only memory.
 Data can be read but not changed.
 This is a non-volatile memory.
 Do not lose data when power is lost.
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12. Types of ROM
 PROM(Programmable Read Only
Memory)
 EPROM(Erasable and Programmable
ROM)
 EEPROM(Electrically Erasable and
Programmable ROM)
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13. RAM ROM
Random-Access Memory Read-Only Memory
RAM is a acronym for Random Access
Memory which means the data and
program in RAM can be read and written.
ROM is a acronym for Read Only
Memory which means the data or program
in ROM can only be read but cannot be
written at all.
RAM is volatile which means the
program and the data in RAM are lost
when the computer is powered off.
ROM is non-volatile. It holds the
programs and data when the computer is
powered off.
RAM stores data during and after
processing.
RAM is also known as a working
memory.
ROM is another type of memory
permanently stored inside the computer.13

14. SECONDARY
MEMORY
 These are magnetic and optical memories
 It is known as backup memory.
 It is non-volatile memory.
 Data is permanently stored even if power is
switched off.
 It is used for storage of data in a computer.
 Computer may run without secondary memory.
 Slower than primary memories.
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15. Types Of Secondary
Memory
 Magnetic Memory
 Optical Medium
 Flash Memory
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16. Magnetic Memory
 Magnetic tape data storage uses digital
recording on to magnetic tape to store digital
information.
 A sequential storage medium used for data
collection, backup and archiving.
 Modern magnetic tape is most commonly
packaged in cartridges and cassettes.
 Magnetic tape was first used to record
computer data in 1951 UNIVAC I.
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17.  Today, tape based systems are usually used for
backup purposes only.
 The major drawback of tape is its sequential
format
 Backups can be taken off-site for greater risk
prevention
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18. OPTICAL MEDIUM
 Optical disks are very much like hard disks.
 Hard disks store information using magnetic material.
 Bits are stored by changing the magnetic properties of the
magnetic material.
 Bits are read by picking up the tiny magnetic field with a
read head.
 Optical disks store information as pits in a physical medium
 A laser is used to determine if a pit is present or not.
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19. FLASH MEMORY
 Flash memory is a non-volatile computer
storage chip that can be electrically erased and
reprogrammed.
 Flash memory is a flexible type of storage.
 Flash memory technology is a mix of EPROM
and EEPROM technologies.
 Ex: Digital cameras, mobile phone, Pen
Drives etc.
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