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Flash Memory
by Matt & Sam
What is Flash Memory?
•Flash memory is a type of memory storage
device for computers & devices.
• It is a type of 'EEPROM' chip, which stands
for Electronically Erasable Programmable
Read Only Memory.
•Flash memory is normally portable, so is
often used to back-up data stored on
computers, or to transport data from one
place to another.
Types of Flash Memory
• Your computer's BIOS chip
• CompactFlash (most often found in digital cameras)
• SmartMedia (most often found in digital cameras)
• Memory Stick (most often found in digital cameras)
• PCMCIA Type I and Type II memory cards (used as solid-state disks in
laptops)
• Memory cards for video game consoles
How Flash Memory Works
• Here is the arrangement of
flash memory:
• Each electron in the 'thin
oxide layer' can contain a bit
of data when charged, so data
will be stored on to the flash
memory by charging certain
electrons to create a binary
number, which the computer
can then read.
• So when an electron in flash
memory is charged, it's binary
value is '1', when not
charged, it is '0'.
How Data is Saved
• Flash memory is 'Read-Only' Memory in the
sense that when there is no power in the flash
memory device, data is still stored.
• It is therefore a 'non-volatile' memory type.
• However, because it is Electronically Erasable
Programmable, data can be erased from flash
memory, by 'discharging' previously charged
electrons where the data was saved.
Common Flash-based electronic devices
The most common type of flash memory in use today is NAND. This name is taken from the electronic logical
gate NAND operator because flash memory uses floating gate MOSFET transistors that are arranged in a similar
way.
There are many consumer electronic devices that use NAND flash memory as storage. Some external storage
solutions also utilize NAND flash memory. The types of hardware that you are likely to come across that uses
this type of technology include:
• MP3 players
• Portable Media Players
• Flash cards / memory sticks such as MicroSD and MicroSDHC
• USB Flash drives
• Smartphones / Mobile phones
• Other multimedia devices
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