flash memory

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Related to Nand memory: EMMC

flash memory

[¦flash ′mem·rē]
(computer science)
A type of electrically erasable programmable read-only memory (EEPROM). While EPROM is reprogrammed bit-by-bit, flash memory is reprogrammed in blocks, making it faster. It is nonvolatile.

flash memory

flash memory

(1) For Adobe's multimedia authoring and playback system, see Flash.

(2) Flash memory is the most popular non-volatile, rewritable storage chip. Comprised of cells that hold a charge without power, flash memory is extremely durable and used in just about every electronic device, including cameras, smartphones, tablets, music players and USB drives. It is also the storage component in solid state drives (SSDs), which increasingly replace hard drives in computers and servers. All flash memory eventually wears out, but most users will have many years of service (see SSD write cycle). See solid state drive.

Evolving from the EEPROM chip, flash was invented by Toshiba in the mid-1980s and named after its ability to erase a block of data "in a flash." However, this block erasing is its least desirable feature because it adds a step. To change what is stored in flash memory, the cells must first be erased in blocks ranging from 16KB to 512KB in length. Then the cells can be written.

NOR Flash for Execution
NOR flash is used for program execution similar to RAM. Introduced by Intel in 1988, NOR supports one-byte random access, which means a program's instructions are executed directly from the NOR flash the same way computers execute instructions in RAM. Unlike RAM, NOR flash does not require power to hold its content. See computer and RAM.

NAND Flash for Storage
Toshiba developed the less costly NAND flash in 1989. It has denser cells and faster erasing and writing than NOR. For example, in a digital camera, an internal NOR chip holds the software, but the removable memory cards are composed of NAND chips. In a computer, a translation layer makes a NAND flash solid state drive (SSD) function like a hard drive for both program and data storage (see FTL). Just like a hard drive, instructions in a program are first read into RAM and then executed. For more on flash architecture, see EEPROM, NAND flash and MLC. See charge trap flash, USB drive, memory card, solid state drive, flash BIOS, early memories and future memory chips.


From Spinning Platters to Flash
Slowly but surely, flash-based solid state drives (SSDs) are replacing the computer's hard drives for storage. Not only are SSDs faster, there is no read/write head to accidentally scratch a platter's surface (see head crash). See solid state drive.







USB Drives "Are" Flash Memory
The ubiquitous USB drives are not much more than a NAND flash memory chip.







Memory Cards Are the Camera's "Film"
NAND flash memory cards such as this 16GB SD Card are used in all modern cameras and camcorders. SD Cards are very popular, and they can hold up to 512GB. See SD Card and memory card.







Disk Pack Storage - 1970s
The SD Card example in the digital camera above holds eight times more storage than all the disk drives in this room full of ICL computers. See disk pack. (Images courtesy of The National Museum of Computing, Milton Keynes, U.K., www.tnmoc.org)







Flash For Sale
This 2014 Micro Center ad highlighted the flash memory products people use every day. Class 10 SD Cards means a minimum of 10 MBytes/sec write speed for HD video recording. See SD Card classes. (Image courtesy of Micro Center, www.microcenter.com)
References in periodicals archive ?
The NAND memory chips are labelled Kingston FB64B08UCT1-00 which happen to be manufactured by Toshiba.
Local chip equipment suppliers have witnessed major growth in their profits in recent times due to the growing use of NAND memory chips.
Through our continued investment in IMFT, we're delivering leadership technology and manufacturing that enable the most cost-effective and reliable NAND memory," says Tom Rampone, vice president and general manager, Intel NAND Solutions Group.
Customers now have access to high-quality IP that enables them to quickly deploy Toggle-mode DDR NAND memory in their product designs, and maximize the benefits of its high-performance and low power features," said Robert Pierce, senior director of NAND Flash IP at Denali Software.
The computer in a pen is slightly fatter than a regular pen but houses, in addition to an ink cartridge, a 32-b processor, an OLED display, an infrared camera, 1- or 2-GB NAND memory, a battery, dual microphones, and a speaker.
RAM, NOR and NAND memory will all continue to play a role in next generation handset designs.
The new 64Gb NAND memory being used in the next-generation eMMC went into production late last month.
The strong demand for both DRAM and NAND memory chips boosted Samsung's margins this quarter.
At this weeks IEEE IEDM conference, nano-electronics research center imec showed for the first time the integration of high mobility InGaAs as a channel material for 3D vertical NAND memory devices formed in the plug (holes) with the diameter down to 45nm.
Watch NAND memory is a Toshiba Flash 8GB and DRAM is a Micron SDRAM 512MB,
TEHRAN (FNA)- A new type of NAND memory design announced in Last August that eschewed PCIe slots or SATA interfaces in favor of attaching flash directly to the DIMM channel was launched.
Summary: Plextor recently unveiled its next-generation of SSD (solid-state drive), which uses the world's smallest 64-gigabit NAND memory chip on 19-nanometer (nm) process technology, at Computex 2013.