 Memory cards are characterised by having a type of memory called flash. This signifies that, even when disconnected from the unit to which they are adapted, they maintain the data in a permanent and secure way, more than a traditional hard disk. It is a type of memory units with great resistance to blows, which maintain their reliability during contusions, provided that they are not bent. That security and advantageous permanence has, on the other hand, a reflection on its price.
Additionally, there are portable card readers that store these in a hard disk and they have an image viewer. They are useful in photography to download the memory of the camera in any place and continue taking pictures.
Subsequently we offer some informative points about a total of eight card types, all present in the market with a diversity of storage capabilities.
* Compact Flash (CF):
Inside the CF there are two types of cards: the Type I and the Type II, which have more capacity, and are a lot more rapid, but are thick and therefore not compatible.
This is the cheapest type of card among all.
In this type of cards it is possible to include a hard minidisk, which although storing more information, is more sensitive to blows and consumes more energy.
* Memory Stick (MS):
Sony launched three types of cards within the MS type:
• Standard: first project of Sony to handle the storage of all its mobile devices- from PC' s to cameras, MP3 players and even mobile phones. The prototype resulted of great quality.
• DUO: this type presents a greater transfer speed but smaller writing velocity; thought up in principle to handle digital content with copyright
• Pro: the fastest one of all (Pro Duo likewise possible), originally thought for cameras to take high speed photos or that would needed a greater shutter velocity.
* Secure Digital (SD): Another of the cards developed by an association, this is the one that counts on the greatest number of manufacturers. In general they have greater access velocity (10-15%) that the rest, although the high price of those of good brands stands out.
* Micro SD: like the SD, although with half their size; currently very much used in mobiles, but also in cameras.
* Micro Drive: it is a type by memory developed by IBM and Toshiba (final phases of the execution). Although in general they are of the ones with greatest capacity, they are of the most expensive and hard to obtain.
* Multi Media (MMC): leaders concerning flexibility, because they are utilised in numerous devices. Nevertheless one must keep in mind that even though they are exactly equal to the Secure Digital (SD), they are not compatible in 100% of the cases.
* Smart Media (SM/SMC): One of the first cards seen in the market, they are typical for the small golden teeth that make them recognisable. The disadvantage of these cards: reduced storage capacity.
* XD Photo Card: manufactured by Olympus and Fuji. In their favour: the cameras of those firms even have the firmware optimized for their growth. Against: limitation to the devices of these firms.
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