what is Nand Flash?

what is Nand Flash?

Nand Flash is a type of memory technology which is popularly used in a lot of data storage devices, like your hard drives, pen drives, SD cards etc.,

This is a non-volatile memory technology that can be electrically erased or reprogrammed.Which can also retain memory without any power supply. So that, all your movies and songs are safely stored in the hard drive, even when the computer is turned OFF.

Why the word FLASH?

Nand Flash:Schematic with Inputs and also Layout with Silicon

Flash refers to a memory technology that can be erased or reprogrammed electrically ( as mentioned above ) and retains any memory that you might have stored in it without any power supply.

Why the word NAND?

The technology makes use of  Floating gate transistors which are connected to resemble a NAND Gate.

What is Floating Gate Transistor?

Known as Floating Gate MOS (FGMOS).Its an FET similar to MOSFET.

Cross Section of FGMOS

The process of  Writing Memory is accomplished by the process of Tunnel Injection.

The process of Erasing Memory is accomplished by the process of Tunnel Release.

Which are Prime companies that manufacture Flash Storage?

• Samsung
• Toshiba
• SanDisk
• Transcend

Coutesy (Images): Wikipedia