flash memory
flash memory
flash′ mem′ory
n.
Noun | 1. | flash memory - nonvolatile storage that can be electrically erased and programmed anew |
单词 | flash memory | |||||||||||||||||||||
释义 | flash memoryflash memoryflash′ mem′oryn.
flash memoryflash memory[¦flash ′mem·rē]flash memoryflash 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 SSD. Erase Before Writing 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 flash memory's peculiarity. Flash memory cells must be erased before they can be written to. Cells make up pages, and pages make up blocks, but while pages are written, only blocks can be erased. Fortunately, this all takes place within the SSD, which during idle cycles, erases no-longer-used "dirty" blocks so there are always "clean" blocks to write to. 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 NAND flash solid state drive (SSD) functions like a hard drive for both program and data storage (see FTL). For more on flash architecture, see EEPROM, NAND flash and MLC. See charge trap flash, USB drive, memory card, SSD, flash BIOS, early memory and future memory chips.
flash memory
Words related to flash memory
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