Comparison of memory cards
- unless otherwise indicated, all images to scale
|Card family||Standards organizations||Varieties||Entry date||Maximum commercially available capacity||Picture||Main features|
|CompactFlash||SanDisk||I||1994||512 GB (CF5 128*250 bytes)||Thinner (3.3 mm), flash only, now up to 512 GB, although standard goes up to 128 PB since CF 5.0|
|II||Thicker (5.0 mm), older flash, but usually Microdrives, up to 128 PiB|
|CFexpress||CompactFlash Association||1.0||2017||1TB||XQD form factor (38.5 mm × 29.8 mm), PCIe 3.0 x2 (2,0 GB/s), NVMe|
|-||-||-||-||PCIe 3.0 x8 (8,0 GB/s), NVMe|
|SmartMedia||Toshiba||3.3/5 V||1995||128 MB||Very slim (45.0×37.0×0.76 mm), no wear leveling controller, up to 128 MB. This particular example shows the write protect sticker (the silver disc).|
|MultiMediaCard||Siemens AG, SanDisk||MMC||1997||16 GB||Slim and small (24×32×1.4 mm), up to 16 GB|
|RS-MMC/MMC Mobile||2003/2005||16 GB||Compact (24×18×1.4 mm), up to 16 GB|
|MMCplus||2005||16 GB||Compact (24×32×1.4 mm), swifter, optional DRM, up to 16 GB|
|MMCmicro||2005||4 GB||Subcompact (14×12×1.1 mm), optional DRM, 16 MB to 4 GB|
|Secure Digital||Panasonic, SanDisk, Toshiba, Kodak||SD||1999||4 GB||Small (32×24×2.1 mm), DRM, up to 4 GB. (2 GB and 4 GB cards use larger block sizes and may not be compatible with some host devices. See Article)|
|miniSD||2003||4 GB||Compact (21.5×20×1.4 mm), DRM, up to 4 GB. (2 GB and 4 GB cards use larger block sizes and may not be compatible with some host devices. See Article)|
|microSD||2005||4 GB||Subcompact (15×11×1 mm), DRM, up to 4 GB. (2 GB and 4 GB cards use larger block sizes and may not be compatible with some host devices. See Article)|
|SDHC||2006||32 GB||Same build as SD but greater capacity and transfer speed, 4 GB to 32 GB (not compatible with older host devices).|
|miniSDHC||2008||32 GB||Same build as miniSD but greater capacity and transfer speed, 4 GB to 32 GB. 8 GB is largest in early-2011 (not compatible with older host devices).|
|microSDHC||2007||32 GB||Same build as microSD but greater capacity and transfer speed, 4 GB to 32 GB.(not compatible with older host devices)|
|SDXC||2009||512 GB||Same build as SD, but greater capacity and transfer speed, 32 GB and higher. Standard goes up to 2 TB (not compatible with older host devices).|
|microSDXC||2009||256 GB||Same build as microSD, but greater capacity and transfer speed, 32 GB and higher. Standard goes up to 2 TB (not compatible with older host devices).|
|Memory Stick||Sony/SanDisk||Standard||1998||128 MB||Slim and narrow (50×21.5×2.8 mm), optional DRM, up to 128 MB|
(not to scale)
|Slim and narrow (50×21.5×2.8 mm), swifter, optional DRM, up to 4 GB|
|Duo||2003||128 MB||Compact (31×20×1.6 mm), optional DRM, up to 128 MB|
|PRO Duo||2002-2006||32 GB||Compact (31×20×1.6 mm), optional DRM, up to 32 GB|
|PRO-HG Duo||2007-2008||32 GB||Compact (31×20×1.6 mm), swifter, optional DRM, up to 32 GB|
|Micro (M2)||2006||16 GB||Subcompact (15×12.5×1.2 mm), optional DRM, up to 16 GB|
|XQD||Sandisk, Sony, Nikon, CompactFlash Association||Standard||2011-2012||>2 TB||High-capacity, high-speed standard using PCIe as interface|
|xD||Olympus, Fujifilm||Standard||2002-2007||512 MB||Slim and small (20×25×1.78 mm), electrically identical to SmartMedia, no wear-leveling controller, up to 512 MB|
|Type M||2005||2 GB||Slim and small (20×25×1.78 mm) but slower read/write, no wear-leveling controller, up to 2 GB|
|Type H||2005||2 GB||Slim and small (20×25×1.78 mm) and swifter, no wear-leveling controller, up to 2 GB|
|Universal Flash Storage Card Extensions||Samsung||UFS Card||2016||>256 GB||Packages the flash memory, currently soldered in shipping smartphones, into a removable card form factor. Uses the SCSI command set including queuing. The electrical interface makes use of differential signaling, which enables high bus speeds and robustness under noisy conditions and reduced pin count (compared to parallel bus alternatives such as UHS-II).|
|USB flash drive||Various||USB 1.1/2.0/3.0/3.1||2000/2001||1 TB+||
(not to scale)
|Universally compatible across most non-mobile computer platforms, their greater size suits them better to file transfer/storage instead of use in portable devices, up to 1 TB.|
Note that a memory card's dimensions are determined while holding the card with contact pins upwards. The length of cards is often greater than their width. Most cards show a directional arrow to aid insertion; such an arrow should be upward.
|Card||Width (mm)||Length (mm)||Thickness (mm)||Volume (mm³)||Mass (g)|
|CompactFlash, Type I||43.0||36.0||3.3||5,108||3.3|
|CompactFlash, Type II||43.0||36.0||5.0||7,740|
|SD, SDHC, SDXC, SDIO||24.0||32.0||2.1||1,613||2.0|
|miniSD, miniSDHC, miniSDIO||20.0||21.5||1.4||602||1.0|
|microSD, microSDHC, microSDXC||11.0||15.0||1.0||165||0.27|
|Memory Stick Standard, PRO||21.5||50.0||2.8||3,010||4.0|
|Memory Stick Duo, PRO Duo, PRO-HG, XC||20.0||31.0||1.6||992||2.0|
|Memory Stick Micro (M2), XC||12.5||15.0||1.2||225||2.0|
|Card||Varieties||Max storage capacity (nom. in GiB)||Theoretical max. capacity (nom. in GiB)||Max read speed (MB/s)||Max write speed (MB/s)||Read-write cycles||Low-level access||Operating voltage (V)||Controller chip||# of pins|
|167||167||NOR/NAND||3.3 and 5||Yes||50|
|2||1,000,000||NAND||3.3 or 5||No||22|
|MMCmobile||2||15||8||1.8 and 3.3||13|
|MMCmicro||2||1.8 and 3.3||13|
|104||104||1.8 and 3.3||Yes||13|
|Secure Digital||SD (SDSC)||512||4||25||25||3.3||Yes||9|
|104 (UHS-I)||104 (UHS-I)||1.8 and 3.3||Yes||9|
|miniSDHC||4||104 (UHS-I)||104 (UHS-I)||11|
|microSDHC||32||104 (UHS-I)||104 (UHS-I)||8|
|microSDXC||256||104 (UHS-I)||104 (UHS-I)||8|
|Memory Stick||Standard||128 MiB
|PRO-HG Duo||32||30 (actual;
|30 (actual; theoretical: 60)||3.3|
|Micro (M2)||16||32||20||20||1.8 and 3.3|
|USB||Full speed (USB 1)||2048
|No hardware limit||1||1||5||Yes||4|
|High speed (USB 2.0)||40||40|
|Super speed (USB 3.0)||240||160|
|Card||Write protection switch ||DRM|
|SmartMedia||Partial, sticker||Partial (optional)|
|SD||Yes ||Yes, CPRM|
|Memory Stick Standard, PRO||Yes||Optional, MagicGate|
|Memory Stick Duo, PRO Duo||No||Optional, MagicGate|
|Memory Stick PRO-HG Duo||No||Optional, MagicGate|
|Memory Stick Micro (M2)||No||Optional, MagicGate|
The following chart gives details on availability of adapters to put a given card (horizontal) in a given slot or device (vertical). This table does not take into account protocol issues in communicating with the device.
Following labels are used:
- + (native) – A slot is native for such card.
- D (Directly compatible) – A card may be used in such a slot directly, without any adapters. Best possible compatibility.
- M (requires a Mechanical adapter) – Such adapter is only a physical enclosure to fit one card sized into another; all electrical pins are exactly the same.
- EM (requires an Electro-Mechanical adapter) – Such adapter features both physical enclosure and pins re-routing as terminals are sufficiently different. No powered elements in such adapter exists, thus they're very cheap and easy to manufacture and may be supplied as a bonus for every such card.
- E (requires an Electronic adapter enclosure) – These adapters must have components—potentially requiring external power—that transform signals, as well as physical enclosure and pin routing.
- X (requires an eXternal adapter) – Technically the same as E, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.
- XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.
- Empty cell – Card cannot be used in such slot, no single adapter is known to exist. Sometimes a chain of adapters can help (for example, miniSD→CF as miniSD→SD→CF).
|I||II||MMC||RS-MMC, MMCmobile||Std||PRO||PRO Duo||Micro||SDSC||miniSD||microSD||SDHC||miniSDHC||microSDHC||SDXC||microSDXC||Std||M||H|
|PCI Express Mini Card||EM|
|Floppy||E||E||E + M||E||E|
|Nintendo DS Slot-1||E|
|Nintendo DS Slot-2||E||E||E|
- Pictures are given in relative scales; they're sized to be WYSIWYG when viewing using 81 PPI monitor.
- Compact Flash Association announces CF 5.0 standard supporting up to 128 PiB of storage Archived 2010-11-22 at the Wayback Machine.
- FUJIFILM Global | xD-Picture Card and Adapters Archived 2008-01-28 at the Wayback Machine.
- Plexus Outbursts specifications Archived 2006-06-27 at the Wayback Machine.
- Apacer's MMC specifications Archived 2006-06-24 at the Wayback Machine.
- Voltage table at All Memory Cards, note that some cards support both voltages (and), and some cards are available in distinct versions (or)
- Explanation of controller chip at All Memory Cards
- CompactFlash Specification Rev. 6.0 Archived 2010-11-21 at the Wayback Machine.
- ACP-EP Specifications Archived 2006-06-22 at the Wayback Machine.
- ACP-EP RS-MMC card features list Archived 2006-06-19 at the Wayback Machine.
- ACP-EP MMCmobile card features list Archived 2006-06-19 at the Wayback Machine.
- Transcend MMCplus 4 GiB
- MMC transferred at up to 52 MiB/s Archived 2007-02-08 at the Wayback Machine.
- Maximum transfer speed is not defined by SD standards. Bus speeds are quoted.
- "Archived copy". Archived from the original on 2014-02-09. Retrieved 2014-02-09.
- Toshiba Adds New High Density SDHC Cards and microSDHC Card to Extensive Memory Card Line-up
- New 4 GiB miniSDHC card Archived 2007-12-15 at the Wayback Machine.
- Sony 32 GB Memory Stick PRO Duo
- Sony Introduces Faster MS Pro HG Duo Card Archived 2013-01-21 at Archive.is
- Sony Memory Stick PRO-HG, up to 32 GB, 8-bit parallel transfer
- SanDisk announces world's largest mobile phone card capacity with 16GB M2
- "Write protection switch at All Memory Cards". Archived from the original on 2016-04-20.
- Some early SD cards may not have a write protection switch.
- The write protect switch signals to the host, which is responsible for write protection. The write protect switch is not connected to the internal circuitry of the card. (SD Card Simplified Physical Layer Specification Archived 2010-07-07 at the Wayback Machine.)
- "Fujifilm accessories xD-Picture Card". Archived from the original on July 11, 2007.
- DataFab EXP-CF
- DataFab EXP 12 in 2 Archived 2007-11-13 at the Wayback Machine.
- DataFab exp 12 in 1 Archived 2007-12-14 at the Wayback Machine.
- DataFab exp M2+microSD Archived 2007-12-14 at the Wayback Machine.
- Transcend CompactFlash-to-PC Card adapter
- Transcend SmartMedia-to-PC Card adapter
- Transcend 5-in-1 Adapter
- Minolta SD-CF1 SD-to-CompactFlash adapter
- Transcend MemoryStick-to-CompactFlash adapter
- Sony MSAC-MCF1N and AD-MSCF1 PRO Duo to CF adapters
- Olympus MACF-10 xD-to-CompactFlash adapter Archived 2006-12-10 at the Wayback Machine.
- Hama xD-to-SM adapter
- In March 2008, Olympus started shipping the MASD-1 microSD-to-xD adapter along with its latest compact digital cameras, with a shape designed to fit only in those latest cameras. The physical adapter is in fact purely electromechanical, although the xD and SD protocols are completely incompatible. This demonstrates that the cameras themselves must understand the SD protocol, and thus the adapter is more properly termed an electronic adapter, with the electronic logic contained in the camera rather than the physical accessory.
- SD cards are usually thicker than MMC ones, and although it uses perfectly compatible pins, not every MMC slot may allow thick SD card to be inserted
- Dragon SD/miniSD/MMC to MS PRO Duo Adapter
- KingMax microSD to MS PRO Duo Adapter[permanent dead link]
- SDHC devices are backward-compatible with normal SD cards. ("Archived copy". Archived from the original on 2011-11-21. Retrieved 2012-01-03.)
- SDXC devices are backward-compatible with SD and SDHC cards. ("Archived copy". Archived from the original on 2011-11-21. Retrieved 2012-01-03.)
- PC Engines IDE to CompactFlash adapters
- Star Empery PT110 SD Card To ATA IDE 3.5 inch Hard Drive Adapter
- 4× SD to SSD IDE Adapter
- Accelerated Compact Flash: The Addonics SATA CF Adapter
- There are many USB-connected "n-in-1" memory card readers, for example Belkin's "Hi-Speed USB 2.0 15-in-1 Media Reader & Writer".
- MS Duo and M2 adapters have appeared in the last 12 months which look like USB memory sticks
- SanDisk @ CES - SD card with built-in USB adapter
- A-Data microSD to USB Adapter Archived 2007-09-15 at the Wayback Machine.
- DCRP Special Report: FlashPath Adapter by Tom Beardmore
- R4 microSD to NDS Slot-1 Adapter Archived 2007-10-31 at the Wayback Machine.
- Supercard to NDS Slot-2 Adapter Archived 2008-03-25 at the Wayback Machine.
- GumstixDocsWiki Frequently Asked Questions: Are SD cards interchangeable with MMC cards?
- Types of Memory Cards
- USB mass storage device class: Mass Storage device class specification 1.4 Date: Feb 19, 2010 — on the site of the USB Implementers Forum.