presentation on memory
TRANSCRIPT
Presented toMd. Rifat Ahmmad Rashid,
Lecturer, Department of CIS, Bangladesh University of Business & Technology
Presented by
1. nameI.D. No. 1011310….2. nameI.D. No. 1011310….
OverviewIntroductionComputer capacityTypes of memoryMain memoryTypes of main memoryTypes of main memory deviceSecondary memoryTypes of secondary memory deviceImportant Secondary Storage MethodsSecondary storage devicesHard disksSome regular usable discsOther types of secondary storageReferences
Introduction Memory is a device that is used to store data or programs on
a temporary or permanent basis for use in an electronic digital computer.
The memory is needed for the following purposes:
1. To store the program and data during execution2. To store the program for repetitive use3. To store the data for future or periodical use4. To store the result of execution
Computer capacity
Bit: Short for binary digit (0s and 1s), the only data that a CPU(Central Processing Unit) can process.
Byte: An 8-bit string of data, needed to represent any one alphanumeric character or simple mathematical operation.
Types of memory
There are three categories of computer memories:
Main Memory (Primary Memory) stores small amounts of data and information that will be immediately used by the CPU (Central Processing Unit).
Secondary Memory (Auxiliary or Backup) stores much larger amounts of data and information (an entire software program, for example) for extended periods of time.Internal Processor Memory stores temporary storage of instruction and data used as working registers.
Main memoryMain memory is a large array of data or bytes. It provides
storage that can be access directly by the CPU.
Major activity of main memory:
1. Keep track of which part of memory currently being used and by whom.2. Decide which process are loaded into memory when memory space becomes available.3. Allocate reallocate memory space as needed.
Types of main memory
Semiconductor Memory Semiconductor memory uses semiconductor-based
integrated circuits to store information. Both volatile and non-volatile forms of semiconductor memory exist.
Magnetic MemoryMagnetic storage uses different patterns of magnetization on a magnetically coated surface to store information. Magnetic storage is non-volatile.
Types of main memory device
Main Memory
ROM RAM Cache Register
Random access memory (RAM): The part of primary storage that holds a software program and small amounts of data when they are brought from secondary storage. Rams are categorised as follows: – SRAM (Static RAM) (flip-flop gates)– DRAM (Dynamic RAM)
Types of Main Memory Device
Read-only memory (ROM): Type of primary storage where certain critical instructions are safeguarded; the storage is nonvolatile and retains the instructions when the power to the computer is turned off. ROMs are categorised as follows: – PROM (programmable)– EPROM (erasable programmable)– EEPROM (electronically erasable
programmable)
Types of Main Memory Device
Types of Main Memory Device Cache memory: A type of primary storage
where the computer can temporarily store blocks of data used more often.
Register: registers are part of the CPU with the least capacity, storing extremely limited amounts of instructions and data only immediately before and after processing.
Secondary Memory Memory capacity that can store very large
amounts of data for extended periods of time.– It is nonvolatile.– It takes much more time to retrieve data
because of the electromechanical nature. – It is cheaper than primary storage.– It can take place on a variety of media– It is permanent memory
Secondary Storage
Magnetic Tape Magnetic Disk CD-ROM
Hard Disk Floppy Disk
Types of Secondary Storage Device
• Magnetic Disk Drive• Floppy Disk Drive• Magnetic Tape Drive• Optical Disk Drive
Important Secondary Storage Methods
Most desktop microcomputer systems have floppy disks, hard disks optical disk drives and High Capacity Floppy Disks.
Secondary Storage Devices
High Capacity Floppy Disks
There are three types of hard disks:– Internal
– Hard-disk cartridge– Hard-disk pack
Hard Disks
Hard-disk cartridge
Some regular usable discsTraditional Floppy Disk
Optical Disks
Compact Disc
Other Types of Secondary Storage
• Solid-state storage Flash memory cards Key chain hard drives
• Internet hard drives
• Magnetic tape
ReferencesNorton,P.(2010-2011) “Introduction to Computer”, 9th edition, Tata McGraw-Hill
Sarker & Gupta,(2005),“Elements of Computer Science”,2nd edition, S.Chand & Company Ltd.
Ahmmad,R.R, Lecturer, Department of CIS, BUBT
Memory - Wikipedia, the free encyclopedia.htm