Flash memory

What is a flash memory?
Types of flash memory
How does it work
Flash memory usage
Advantages and disadvantages

1. FLASH MEMORY
Presented by
Abdullah AL Mamun Shiam
Id: 18-37075- 1
Section E (Digital Electronics)

2. HISTORY
Toshiba was searching for a technologythat would replace
old data-storage media
Japanese engineerMasuokaFujio invented it in the early
1980s
Flashwas named by AriizumiShoji, a coworker of Masuoka
The name came from its erasing nature

3. WHAT IS A FLASH MEMORY?
Solid state, non- volatile memory chip
Stores electrical charges
Belongs to the EEPROM (Electric Erasable Programmable Read
Only Memory) Group
Memory cells are made of floating-gate transistors
Light, compact, shock resistant, energy efficient

4. TYPES OF FLASH MEMORY
NOR FLASH MEMORY
High transfer efficiency
Slow write and erase speeds
Programs can be executed directly
Cost effective in small capacity of 1 –4 MB
NAND FLASH MEMORY
Accessed alike block devices
Faster erases, sequential writes, and reads
High capacity data storage

5. HOW DOES IT WORK
Two gates on top control & floating (P type)
A cell sensor monitors the level of charge passing
through the floating gate
If flow>50% value is 1
Below 50% value is 0

6. FLASH MEMORY USAGE
Usb Flash
M2 SSd
Memory Card
MMC
NVME SSd
SD HC CARD
SD Card
SmartMedia Card
xD Picture Card

7. HOW LONG DOES FLASH MEMORY LAST?
Generally speaking, a Flash Drive can be used between 10,000 – 100,000 write/erase cycles
The data will normally stay valid for a period of up to 15 years. You can format it and reuse
again for another 10- 15 years
Frequently used Flash Drives however will require more care. Lifespan can be decreased
depending on how it is cared for.
Day to day space, speed and longevity are updating in flash technology

8. ADVANTAGES AND DISADVANTAGES
Durable and portable
Can be immersed in water
Read and erase easily
Supports a wide range of
systems
Both nand and nor has limited
cycles
About 100,000 is the typical
number
Can get infected by virus
When memory crashes all data
is lost

9. REFERENCES
•How does flash memory work?(2020, November 25). Explain that
Stuff.https://www.explainthatstuff.com/flashmemory.html
•Notes,E. (n.d.).What is flash memory technology » electronics notes. Electronics Notes:
reference site for electronics, radio & wireless.https://www.electronics-
notes.com/articles/electronic_components/semiconductor- ic-memory/flash- technology-
what-is.php
•How flash memory works. (2000, August 30).
HowStuffWorks.https://computer.howstuffworks.com/flash- memory.htm
•Flash memory. (n.d.). Encyclopedia
Britannica.https://www.britannica.com/technology/flash- memory
•Flash memory. (2002, April 27). Wikipedia, the free encyclopedia. RetrievedDecember18,
2020, fromhttps://en.wikipedia.org/wiki/Flash_memory