Memory card
Portable flash memory storage for digital devices.
A memory card is a small, removable storage device that uses flash memory to hold digital data. It plugs into a socket on a device, offering a way to add extra memory without a bulky USB stick sticking out. You’ll find them in digital cameras, early game consoles like the Neo Geo, action cameras, drones, e-readers, handheld game consoles, dashcams, and some older smartphones—though many newer phones now rely on built-in storage instead. Common types include SD cards (including microSD), Sony’s Memory Stick, and CompactFlash. As of 2024, SD cards are the most widespread.
The technology behind memory cards is flash memory, invented by Fujio Masuoka at Toshiba in 1980 and first sold by Toshiba in 1987. In the 1980s, the push for memory cards came from a need to replace floppy disk drives in laptops—they used less power, weighed less, and took up less space. Some were also marketed as cheaper alternatives to ROM cartridges. Many companies created competing, incompatible formats, like the Bee Card, Astron SoftCard, Sega Cards, NEC UltraLite memory cards, and the Mitsubishi Melcard (which came in 60- and 50-pin versions). The Sega Card was a low-cost option for game cartridges. Some early cards were used just to expand laptop memory.
In 1985, the Japan Electronic Industry Development Association (JEIDA) started working on a memory card standard, releasing the JEIDA memory card in 1986. The Personal Computer Memory Card International Association (PCMCIA), formed in 1989, promoted a PC standard and worked with JEIDA, adopting their 68-pin connector. The first PCMCIA Type I cards (later called PC Cards) came out in 1990, merging the JEIDA and PC Card standards. This format later handled other devices besides memory, like modems. PC Card was one of the first commercial memory card formats, but it’s now mainly used in industrial gear and for connecting I/O devices.
Some early memory cards used SRAM, which needed a lithium battery to keep data. These were faster than flash cards. Early PCMCIA cards held just 1 to 5 MB and cost $100 per MB. Other early cards, like the Bee Card, used non-modifiable ROM, write-once EPROM, or rewritable EEPROM. In 1992, SanDisk released FlashDisk, a PCMCIA card that didn’t need a battery because it used flash memory. Smaller formats arrived in 1994, starting with CompactFlash, then SmartMedia and Miniature Card. The demand for tiny cards in cell phones, PDAs, and compact digital cameras made earlier “compact” cards seem huge. The SD card was announced in 2000, meant to be a single format for many devices and also work as an expansion slot for new features. In 2001, SmartMedia held 50% of the digital camera market, while CF dominated professional cameras. By 2005, SD and similar MMC cards had mostly replaced SmartMedia, though they faced stiff competition from Memory Stick variants and CompactFlash. In industrial and embedded fields, old PC Card memory cards still have a niche, while mobile phones and PDAs pushed cards to become even smaller.
Memory cards were pricey at first—$3 per megabyte in 2001—which led to tiny spinning-disk drives like the Microdrive, PocketZip, and Dataplay. The Microdrive offered more capacity than memory cards then, but all three became obsolete by 2006 as flash memory got cheaper and more capacious. Starting in 2010, Sony (which had used only Memory Stick) and Olympus (only xD-Card) began adding SD card slots to new products, effectively ending the format war in SD’s favor. By the late 2010s, faster formats like CFexpress and Universal Flash Storage (UFS) appeared to handle 4K, 8K, and RAW video, plus high-speed burst photography. XQD cards, once meant to replace CompactFlash, have mostly been replaced by CFexpress Type B, which uses the same physical size but a faster PCIe interface.
- inventor_of_flash_memory
- Fujio Masuoka at Toshiba
- year_flash_memory_invented
- 1980
- most_common_type_as_of_2024
- SD cards
Lore & Background
The basis for memory card technology is flash memory. The development of memory cards was driven in the 1980s by the need for an alternative to floppy disk drives that had lower power consumption, had less weight and occupied less volume in laptops. Some were also marketed as a lower cost alternative to ROM cartridges. Several competing and incompatible memory card formats were developed by various vendors, such as the Bee Card, Astron SoftCard, Sega Cards, NEC UltraLite memory cards, and the Mitsubishi Melcard. The Sega Card was developed as a cheaper alternative to game cartridges. Some memory cards were used for memory expansion in laptops. This format later included support for other devices besides memory cards. PC Card was among the first commercial memory card formats to come out, but is mainly used in industrial applications and to connect I/O devices such as modems. Some early memory cards used SRAM as a storage medium, which required a lithium battery to keep the contents in the SRAM. These cards were faster than their flash counterparts. Other early cards such as the Bee Card contained non-modifiable ROM, Write once read many EPROM or rewriteable EEPROM memory. In 1994, memory card formats smaller than the PC Card arrived. The first one was CompactFlash and later SmartMedia and Miniature Card. The desire for smaller cards for cell-phones, PDAs, and compact digital cameras drove a trend that left the previous generation of 'compact' cards looking big. In 2000 the SD card was announced. SD was envisioned as a single memory card format for several kinds of electronic devices, that could also function as an expansion slot for adding new capabilities for a device. In industrial and embedded fields, even the venerable PC card (PCMCIA) memory cards still manage to maintain a niche, while in mobile phones and PDAs, the memory card has become smaller. The Microdrive had higher capacities than memory cards at the time. All three concepts became obsolete once flash memory prices became lower and their capacities became higher by 2006. New products of Sony (previously only using Memory Stick) and Olympus (previously only using XD-Card) have been offered with an additional SD-Card slot beginning in 2010. Effectively, the format war has turned in SD-Card's favor. By the late 2010s, newer high-speed formats such as CFexpress and Universal Flash Storage (UFS) emerged to meet the demands of 4K, 8K, and RAW video recording, as well as high-speed continuous photography. XQD cards, once positioned as a successor to CompactFlash, have largely been replaced by CFexpress Type B, which shares the same physical form factor but uses a faster PCIe interface.
Reader's Guide
Memory cards have been a pivotal technology in the evolution of portable digital storage, enabling the expansion of memory in devices ranging from digital cameras to early game consoles like the Neo Geo. Their development was driven by the need for a compact, low-power alternative to floppy disk drives in laptops, and they also served as a cheaper alternative to ROM cartridges. The history of memory cards is marked by a series of competing and incompatible formats, including PC Card, CompactFlash, SmartMedia, Memory Stick, and SD cards, with SD cards emerging as the most common type by 2024. The format war gradually resolved in favor of SD cards, as evidenced by Sony and Olympus adding SD card slots to their products in 2010. The introduction of high-speed formats like CFexpress and UFS in the late 2010s addressed the demands of high-resolution video and photography. Despite the rise of internal storage in modern smartphones, memory cards remain widely used in action cameras, drones, e-readers, and other portable devices, and continue to be essential in industrial and embedded applications.
Did You Know?
- Some early memory cards used SRAM as a storage medium, which required a lithium battery to keep the contents in the SRAM.
Frequently Asked Questions
What is a memory card in computing?
A memory card is a small, portable electronic storage device that holds digital data using flash memory. It plugs into a dedicated socket on a device, letting you expand storage without needing a protruding USB stick.
What is the most common type of memory card in 2024?
SD cards remain the dominant form factor as of 2024, found in everything from action cameras and drones to dashcams and handheld consoles. Their small size and standardized socket make them the default choice across consumer electronics.
Why do many modern smartphones no longer have memory card slots?
Manufacturers have largely shifted to larger built-in internal storage, making expandable slots redundant for most users. As a result, newer phones have phased out the card slot in favor of fixed, non-removable memory.
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