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What is Flash Memory
Flash memory is a type of EEPROM (Electrically Erasable Read-Only MemoryErasable Read-Only Memory). The data stored in flash memory remains safe even when there is no power supply. But the data stored in flash memory can be erased and rewritten by a high voltage key shot.
Flash memory history
Flash memory was invented by Fujio Masuoka in the early 1980s. Fujio Masuoka manufactured flash memory while working for the Toshiba company. In 1984, Toshiba introduced flash memory to the market. After this, in 1988, Intel made NOR flash memory for the processor.
How Does Flash Memory Work?
Flash memory is built into solid-state chips, and each chip contains an array of flash memory cells. Flash memory uses electric circuits to log data, instead of using the traditional electromechanical method.
Current flows through the transistor between the electrical input (source) and electric output (drain) of each cell. Transistor controls the path of current by acting as an on-off switch or gate.
An on transistor allows electron flow, which stores a 1 in the binary code, and an off transistor blocks electrons and stores a 0.
A volatile memory returns all gates to the 0 position when the power supply is turned off, thus erasing all stored data.
But a non-volatile memory works by connecting another gate, which is known as a floating gate. As electrons pass through the transistor energized, some electrons stick to the floating gate, and with or without electricity remain there indefinitely to store 1 .
All types of programmable ROM (PROM) experience this partial loss of electrons. The gate in the EEPROM will only block electrons when a user applies a specific negative voltage to turn the transistor back to 0.
Types of Flash Memory
There are mainly two types of flash memory and both of them are used for different specific purposes.
- NAND Flash Memory
- NOR Flash Memory
1 – NAND Flash Memory
Reading data in NAND flash memory is slow, it can only access memory in blocks. NAND is an inexpensive flash memory. It is suitable for large size files and frequent updates. file able to store efficiently. At present, flash memory is widely used in the form of Pan Drive, SD card etc.
2 – NOR Flash Memory
NOR flash memory is capable of reading data at a much faster speed than NAND. It can read and edit data with greater accuracy. Its cost is high compared to NAND flash memory. The NOR rack is the ideal memory for running small code instruction programs. Users mostly choose NOR flash memory for code execution.
Flash memory functions
Following are the main functions of flash memory –
- Flash memory is a storage device used to store data.
- Flash memory is capable of storing data for a long time, so flash memory is also used in data backup.
- transfer data from one computer to another computer Flash memory is used to transfer the .
Advantages of Flash Memory
Following are some of the major advantages of flash memory –
- Flash memory is a permanent memory, the data stored in it remains safe even if the power supply is not available.
- Flash memory is a good option for data backup, data transfer and for storing data for a long time.
- Data stored in flash memory can be erased and rewritten.
- Flash memory is very easy to use.
- Flash memory consumes less power.
Disadvantage of Flash Memory
Flash memory also has some disadvantages, such as –
- Every bit of flash memory costs more than a hard drive.
- Flash memory is a bit slow as compared to other storage devices.
- Old data has to be deleted to store new data.
Flash memory FAQ
Flash memory is a storage device used to store data securely for a long time.
Flash memory is a non volatile memory.
There are 2 types of flash memory – NOR and NAND flash memory.
Flash memory was invented in the 1980s by Fujio Masuoka, an engineer at the Toshiba company.
Flash memory is used in mobile phones, digital cameras, tablets, computers, etc.
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