# flash memory

> electronic non-volatile computer storage device

**Wikidata**: [Q174077](https://www.wikidata.org/wiki/Q174077)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Flash_memory)  
**Source**: https://4ort.xyz/entity/flash-memory

## Summary
Flash memory is an electronic non-volatile computer storage device that retains data even when power is removed. It is widely used in portable electronics like USB drives, memory cards, and smartphones due to its compact size, durability, and energy efficiency. Unlike volatile memory (e.g., RAM), flash memory does not require constant power to preserve stored information.

## Key Facts
- Non-volatile storage: Retains data without power.
- Used in USB flash drives, memory cards, smartphones, and BIOS.
- Distinct from solid-state drives (SSDs) and random-access memory (RAM).
- Characterized by write endurance, limiting the number of erase/write cycles.
- Classified under computer storage media and solid-state storage.
- UNSPSC code: 32101622.
- Sitelink count: 64 (Wikidata).
- Examples include Toshiba’s eMMC NAND Flash ICs.
- Notable aliases: flash EEPROM, flash ROM, Flashspeicher.

## FAQs
### Q: How does flash memory differ from RAM?
A: Flash memory is non-volatile (retains data without power), while RAM is volatile (loses data when powered off). Flash memory is also slower to write/erase compared to RAM.

### Q: What are common uses of flash memory?
A: Flash memory is used in USB drives, memory cards (e.g., SD cards), smartphones, tablets, and embedded systems like BIOS for computers.

### Q: Is flash memory the same as an SSD?
A: No. While both are solid-state, SSDs use flash memory but include additional circuitry and interfaces (e.g., SATA) for faster access and higher capacities, resembling traditional hard drives in function.

## Why It Matters
Flash memory revolutionized data storage by offering a compact, lightweight, and energy-efficient alternative to magnetic storage (e.g., hard drives) and volatile memory (e.g., RAM). Its ability to retain data without power made it indispensable for portable electronics, enabling the development of devices like smartphones, digital cameras, and USB drives. Flash memory also underpins modern computing infrastructure, from embedded systems to data centers, by providing durable, low-power storage solutions. Its impact is evident in the obsolescence of floppy disks, CDs, and other removable media, transforming how data is stored, transferred, and accessed globally.

## Notable For
- **Non-volatility**: Preserves data without power, unlike RAM.
- **No moving parts**: More durable and shock-resistant than mechanical hard drives.
- **Write endurance limitations**: Cells degrade over time with repeated erasures, requiring wear-leveling techniques.
- **Versatility**: Found in diverse applications, from consumer electronics to industrial systems.
- **Distinction from SSDs**: Flash memory is a component of SSDs but lacks their advanced controllers and interfaces.

## Body

### Definition & Classification
Flash memory is a type of **computer storage media** and **non-volatile memory**, classified under solid-state storage. It is an implementation of **flash EEPROM** (electrically erasable programmable read-only memory), distinct from traditional ROM or RAM.

### Technical Characteristics
- **Non-volatile**: Data persistence without power.
- **Write endurance**: Limited erase/write cycles per block (varies by design).
- **Access method**: Semiconductor-based, enabling faster read/write speeds than mechanical storage.
- **Structure**: Uses NAND or NOR configurations (e.g., Toshiba’s NAND flash ICs).

### Applications
- **Consumer electronics**: Smartphones, tablets, digital cameras.
- **Portable storage**: USB flash drives, SD/microSD cards.
- **Embedded systems**: BIOS/UEFI firmware, automotive systems, IoT devices.
- **Enterprise storage**: SSDs (which incorporate flash memory).

### Differentiation from Similar Technologies
- **vs. RAM**: Non-volatile vs. volatile; slower write speeds but persistent storage.
- **vs. SSDs**: Flash memory is a raw storage medium, while SSDs are devices that use flash memory with added controllers and interfaces.
- **vs. Hard drives**: No moving parts, lower latency, and higher durability.

### Industry Standards & Identifiers
- **UNSpsc code**: 32101622 (category for procurement).
- **Wikidata**: Sitelink count of 64, reflecting broad multilingual coverage.
- **Library of Congress Authority ID**: sh93007615.
- **Encyclopedia Britannica**: Covered under "technology/flash-memory" with attribution to Erik Gregersen.

## References

1. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
2. Freebase Data Dumps. 2013
3. YSO-Wikidata mapping project
4. Quora
5. National Library of Israel
6. KBpedia
7. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)