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This table provides summary of comparison of various flash memory cards, as of 2017.
Video Comparison of memory cards
Common information
- unless otherwise indicated, all images to scale
Maps Comparison of memory cards
Physical details
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.
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Speed comparison
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Technical details
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Consumer details
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Compatibility
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).
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References
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External links
- 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.
Source of the article : Wikipedia
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