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 technology that would replace
old data-storage media
 Japanese engineer Masuoka Fujio invented it in the early
1980s
 Flash was named by Ariizumi Shoji, 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. Retrieved December 18,
2020, from https://en.wikipedia.org/wiki/Flash_memory