SD Memory
SD memory cards (Secure Digital) storage media are widely used in portable technology devices such as cameras, mobile phones, MP3 players, camcorders and game consoles. They are the big winners of the great tide of flash memory cards small size that became popular in the late nineties. Derived from a previous model known as MMC, sponsored by Siemens and Sandisk. Your standards are governed by the Secure Digital Card Association.
Although there are commercially available in two variants with a smaller size as MiniSD and MicroSD cards, the latter used in mobile phones with multimedia capabilities, standard dimensions are: 32 mm high, 24 mm wide and 2 1 millimeter thick. The variants can also be used in standard SD readers via an adapter, sold along with the memory card, MiniSD or MicroSD. However, the original reports (factory) of 3G mobile phones do not include the adapter, so you have to buy it later.
Appeared in 1999 and, initially, they thought of them as a system to protect copyright of intellectual works
Appeared in 1999 and, initially, they thought of them as a system to protect the copyrights of intellectual work, as they have a sophisticated method of encryption. The first were used by Kodak, Casio, Hewlett Packard, Nikon, Minolta, Panasonic and Toshiba, but now they accept almost all devices except the Sony brand, which have their own "Memory Stick".
It is rare to accept them, however, the desktop computers. For its use is recommended to buy an external drive with USB connectivity, for a price below 20 euros. However, many devices incorporate SD card readers, from laptops to multi-function printers and multimedia devices. This will facilitate the processing of data in different devices, since it can directly access the card without an intermediate device or external reader.
You can get a picture and immediately remove the card from the camera to introduce it into the reader slot of the laptop
You may obtain a digital photograph and immediately, removing the card from the camera to introduce it into the reader slot of the laptop and move the image to digital editing software or hard drive. Then it can save the edited version or upload to a web service like Flickr. Another option would be removing the card from the camera and insert it into the slot on the printer, without using the computer.
The capacity of these memory cards has grown exponentially in recent years. While in 2005 a typical SD card had a capacity of between 128 megabytes and 512 megabytes, some cards now reach 64 gigabytes of capacity, ie, 65,536 megabytes.
SDHC, designed for digital imaging
Among the SD cards are differences in transfer speeds. Certain devices such as cameras and camcorders, they need higher-speed cards to record them quickly. The format SDHC (Secure Digital Hight Capacity) is a system developed by Panasonic to work with this range of next-generation multimedia devices and thereby guarantee a transmission rate that does not distract from the main functions. SDHC cards need not be the fastest who are in the market, but it guarantees a minimum transfer rate.
SDHC cards need not be the fastest who are in the market, but it guarantees a minimum transfer rate
SDHC cards are categorized into different classes determined by the speed of data transmission that guarantees minimum. The last of these appeared on the market is in Class 10, which raised the minimum transfer at 10 megabytes per second.
By using SDHC cards, it should be noted that only work on devices that support this format (usually indicated by a logo on the casing of the device), but your readers can be used with SD cards. In addition, some products are only compatible with the SDHC format to a storage limit. Therefore acquire a higher capacity card could be useless.
SDXC, the format of the future
Whether the reader is used, another of the limitations of the SDHC format is its storage capacity, set at 32 gigabytes or less. To overcome this limit, Toshiba launched in early 2009 SDXC format, which present themselves as the continuation of SDHC cards.
SDXC be used on cards with storage capacity ranging from 32 gigabytes and 2 Terabytes
In SDXC, the transfer rate for writing (get info) is guaranteed at 35 megabits per second, while the reading speed (pour information) up to 60 megabits per second. This new format will be used on cards with storage capacity ranging from 32 gigabytes and 2 terabytes (1,000 gigabytes), although the flash memory card largest capacity SDXC made to date is 64 gigabytes and will be available in the market from November .