Dynamic random-access memory (DRAM) is a type of random-access memory that stores each bit of data in a separate capacitor within an integrated circuit. The capacitor can be either charged or discharged; these two states are taken to represent the two values of a bit, conventionally called 0 and 1. Since capacitors leak charge, the information eventually fades unless the capacitor charge is refreshed periodically. Because of this refresh requirement, it is a dynamic memory as opposed to SRAM and other static memory.
The main memory (the "RAM") in personal computers is dynamic RAM (DRAM). It is the RAM in laptop and workstation computers as well as some of the RAM of video game consoles.
The advantage of DRAM is its structural simplicity: only one transistor and a capacitor are required per bit, compared to four or six transistors in SRAM. This allows DRAM to reach very high densities. Unlike flash memory, DRAM is volatile memory (cf. non-volatile memory), since it loses its data quickly when power is removed. The transistors and capacitors used are extremely small; billions can fit on a single memory chip.
Read more about Dynamic Random-access Memory: History, Operation Principle, Error Detection and Correction, Packaging, Versions, Security
Famous quotes containing the words dynamic and/or memory:
“The nearer a conception comes towards finality, the nearer does the dynamic relation, out of which this concept has arisen, draw to a close. To know is to lose.”
—D.H. (David Herbert)
“Twenty or thirty years ago, in the army, we had a lot of obscure adventures, and years later we tell them at parties, and suddenly we realize that those two very difficult years of our lives have become lumped together into a few episodes that have lodged in our memory in a standardized form, and are always told in a standardized way, in the same words. But in fact that lump of memories has nothing whatsoever to do with our experience of those two years in the army and what it has made of us.”
—Václav Havel (b. 1936)