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memory types

Following are the different types of memory technologies used in electronic devices. The two major categories are volatile and non-volatile. Volatile chips lose their content the instant power is removed, while non-volatile memories retain their content. See early memories for a blast from the past.

Volatile

Rewritable - Byte Addressable (DRAM and SRAM)
Dynamic RAM (DRAM) and static RAM (SRAM) chips are the "working storage" in every computer. DRAM is the main memory in a computer and SRAM is used for high-speed caches and buffers. Both types are "byte addressable," which means that data can be read and written one byte at a time. Their major drawback is that DRAM and SRAM require power to hold their content. See dynamic RAM, static RAM and byte addressable.

Future Memories
The Holy Grail for future computer memories is to create a byte addressable RAM chip with the speed of static RAM, the density of dynamic RAM and the non-volatility of flash. See future memory chips.

Non-Volatile

Rewritable - Byte Addressable - Symmetric
EEPROM chips and F-RAM, which have been on the market for some years, along with newer memory technologies, offer the byte addressability of DRAM and SRAM, but do not lose their content when the power is turned off. In addition, read and write speeds are equal or nearly the same. See EEPROM, F-RAM and future memory chips.

Rewritable Flash - Block Writes - Asymmetric
Flash memory is the most widely used non-volatile memory chip in both computers and consumer electronics (CE) devices. Although reads are random access to the byte level, writing is done at the block level similar to writing a disk sector. Speeds are asymmetric; it takes longer to write than read. See flash memory.

Rewritable When Removed (EPROM)
EPROM chips are initially written in an external "programmer" device and must be removed from the circuit board and placed back in the device for reprogramming. See EPROM.

Permanent (ROM and PROM)
Data and instructions in ROM and PROM chips can never be changed. ROMs are manufactured, while PROMs are programmed in an external device like EPROMs. See ROM and PROM.

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No references found	Proponents have argued that PCM could eventually take the place of NAND and NOR flash memory types being used in mobile devices. Samsung sees major benefits from phase-change memory by Network World Middle East The PU-10W digital picture frame like many Portable USA frames has ports for 2 memory cards which are compatible with most memory types, and also has 128 MB of internal memory to store a good number of digital pictures directly on the frame. The Portable USA Digital Picture Frames to Consider by Glenn VanLand / Computers and Internet community The Hornet has an optional media card reader that supports seven different flash memory types. MONARCH COMPUTER UNVEILS SMALL-FORM-FACTOR PCS/WORKSTATIONS by Computer Workstations	memory mapping memory module memory module configurations memory overlay memory port memory power memory print memory printout memory protect Memory Protection memory RAID memory register memory resident memory scrubbing memory search routine memory smash memory sniffer memory sniffing Memory Stick memory storage memory switch memory trace memory tube memory twist Memory Type Range Registers memory types memory typewriter Memory Unit Memory, Mr. memory-reference instruction memory-segmentation control memotron Memphis Memphis in May International Festival Memphis State Recreation Area Memphis Urban Parks Memphis, University of Memphremagog Memphremagog, Lake memristor MEMS MEMS microphone MEMS mirror Memucan Men's Houses men's room Men's Societies men-, meno- Mena Mena, Juan de menacme	Memory Store Memory Subassembly Memory swapping Memory swapping memory switch Memory System Memory Technologies, Incorporated Memory Technology Device Memory Technology Driver Memory Technology, Design, and Testing Memory Test Option Memory Time Switch CMOS Memory Time Switch Large Memory to Memory interface memory trace memory trace memory trace memory traces memory traces memory traces memory training memory training memory training memory training Memory Translator Hub memory tube memory twist Memory Type Range Register Memory Type Range Registers Memory Type Range Registers memory types memory typewriter Memory Unit Memory Unit Memory wall Memory wire Memory Write Memory Write and Invalidate Enable Memory, Mr. Memory, Tradition and Text Memory-Aware Reference Stack Memory-Based Cognitive Framework Memory-Based Language Processing Memory-Based Reasoning Memory-Controller Translation Look-Aside Buffer Memory-Enhanced Test Driver Memory-Level Parallelism Memory-Mapped Configuration Register Memory-mapped I/O Memory-Mapped Register Memory-Pooling-Assisted Data Splitting memory-reference instruction memory-segmentation control Memory-Space-Memory Memory/Memory Control Replacement Program Memoryless Binary-Input Output-Symmetric Channel

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No references found

Proponents have argued that PCM could eventually take the place of NAND and NOR flash memory types being used in mobile devices.

Samsung sees major benefits from phase-change memory by Network World Middle East

The PU-10W digital picture frame like many Portable USA frames has ports for 2 memory cards which are compatible with most memory types, and also has 128 MB of internal memory to store a good number of digital pictures directly on the frame.

The Portable USA Digital Picture Frames to Consider by Glenn VanLand / Computers and Internet community

The Hornet has an optional media card reader that supports seven different flash memory types.

MONARCH COMPUTER UNVEILS SMALL-FORM-FACTOR PCS/WORKSTATIONS by Computer Workstations

Memory Store
Memory Subassembly
Memory swapping
Memory swapping
memory switch
Memory System
Memory Technologies, Incorporated
Memory Technology Device
Memory Technology Driver
Memory Technology, Design, and Testing
Memory Test Option
Memory Time Switch CMOS
Memory Time Switch Large
Memory to Memory interface
memory trace
memory trace
memory trace
memory traces
memory traces
memory traces
memory training
memory training
memory training
memory training
Memory Translator Hub
memory tube
memory twist
Memory Type Range Register
Memory Type Range Registers
Memory Type Range Registers

memory types

memory typewriter
Memory Unit
Memory Unit
Memory wall
Memory wire
Memory Write
Memory Write and Invalidate Enable
Memory, Mr.
Memory, Tradition and Text
Memory-Aware Reference Stack
Memory-Based Cognitive Framework
Memory-Based Language Processing
Memory-Based Reasoning
Memory-Controller Translation Look-Aside Buffer
Memory-Enhanced Test Driver
Memory-Level Parallelism
Memory-Mapped Configuration Register
Memory-mapped I/O
Memory-Mapped Register
Memory-Pooling-Assisted Data Splitting
memory-reference instruction
memory-segmentation control
Memory-Space-Memory
Memory/Memory Control Replacement Program
Memoryless Binary-Input Output-Symmetric Channel