EI 1H Group 2

Presentation on Computer Memory Systems

Presenter : Teteh Camillus Chinaedu

Content Provided by : Mohammad AlkhateebZakaria Ameziane

Facilitator :Polad Samadzade

Computer Memory

• A computer Memory is a physical device capable of storing information permanently or temporarily.

Volatile vs Non Volatile Memory• Memory can be either volatile or non volatile

• Volatile memory is a memory that loses its content when the computer or hardware device loses power. Eg. The random access memory (ram).

• Non volatile memory is memory that keeps its data even when the computer loses power. Eg. the (EEPROM).

EEPROM ?

• It stands for Electrically erasable programmable read only memory.

• It was developed by George Perlegos while at intel in 1978 and unlike most memory in a computer, this memory remembers data when the power is turned off.

Two Main Types Of Computer Memory

Primary Memory

• This is the memory that the computer accesses first or directly, it allows the computer to access running applications that are temporarily stored in specific memory location.

Secondary Memory

• This is where our program and data are saved for long term purposes.

Difference between the Primary and Secondary Memory

Primary Memory• Fast• Expensive• Low Capacity• Works directly with the

processor

Secondary Memory• Slow• Cheap• Large Capacity• Not connected directly to

the processor

Memory Hierachy

HDD vs SDD

HDD• Draws more power (6 – 7

watts)• It is very affordable• Typically larger than 500gb

to 2Tb for notebook sized drives

• Around 30 – 40 seconds average bootup time

• Slower than the SSD

SSD• Draws less power (2 – 3

watts)• It is very expensive• Typically less than 1Tb for

notebook sized drives

• Around 10 – 13 seconds bootup time

• 30% faster than the HDD

What is this ?

Evolution Of External Memory Storage

Cloud Storage

• This is a cloud computing model in which data is stored on remote servers and accessed from the internet.

• Cloud computing is believed to have been invented by Joseph Carl Robnett Licklider in the 1960s.

Thank You For Your Audience !