TECHNOLOGY

What is DRAM and how does it differ from NAND flash memory?

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DRAM is a type of computer memory that temporarily stores data while your device is running, while NAND flash memory is permanent storage that keeps data even when powered off. DRAM is faster but loses all data without power, whereas NAND flash is slower but retains data indefinitely.

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DRAM Full NameDynamic Random Access Memory
NAND Full NameNAND Flash Memory
DRAM PersistenceData is lost when power is turned off
NAND PersistenceData remains stored permanently until intentionally deleted
DRAM SpeedMuch faster, measured in nanoseconds
NAND SpeedSlower than DRAM, but adequate for storage purposes
DRAM CostMore expensive per gigabyte

What is DRAM?

DRAM stands for Dynamic Random Access Memory. It is the working memory your computer uses while it is turned on. When you run programs, open files, or browse the internet, data is temporarily stored in DRAM so your processor can access it quickly. Think of it like your desk at work where you keep the papers you are currently using. DRAM needs constant electrical power to maintain the data stored in it.

What is NAND Flash Memory?

NAND flash memory is the permanent storage in your device, such as solid state drives (SSDs) or the storage in phones and tablets. It holds all your files, programs, photos, and documents. Unlike DRAM, NAND flash memory does not need power to keep your data safe. Once you save something to NAND flash storage, it stays there until you delete it. This is similar to a filing cabinet where documents are stored permanently.

Key Differences

DRAM and NAND flash memory serve different purposes in a computer. DRAM is very fast because the processor needs quick access to data while running programs. NAND flash is slower but can store much more information for a longer time. DRAM is cleared every time you restart your computer, while NAND flash keeps everything saved. DRAM is also more expensive per gigabyte than NAND flash, so computers use smaller amounts of DRAM but larger amounts of NAND flash storage.

How They Work Together

In a typical computer, DRAM and NAND flash work as a team. When you open a file stored on NAND flash, the computer copies parts of it into DRAM so the processor can work with it quickly. Once you finish working and save the file, it goes back to NAND flash for long-term storage. This system balances speed and capacity. Your computer has a small amount of fast DRAM for immediate work and a larger amount of NAND flash for long-term storage.

Real-World Examples

Your laptop typically has 8 to 16 gigabytes of DRAM and 256 to 512 gigabytes of NAND flash storage. A smartphone might have 6 to 8 gigabytes of DRAM and 128 to 512 gigabytes of NAND flash. Your computer's operating system, programs, and files are all stored in NAND flash. Only the data your programs are actively using right now is in DRAM.

Sources

  1. crucial.com (crucial.com)
  2. kingston.com (kingston.com)
  3. intel.com (intel.com)