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What are the SD Memory Cards

Nov 13th 2012 at 3:10 AM

The SD memory cards (Secure Digital) are a family of memory cards developed from the MMC that are most prevalent in the market and can find them in all sorts of devices, such as digital cameras, PDAs, mobile, portable or consoles. The range of SD memory cards consists of four standards: SDSC (Standard Capacity SD), SDHC (SD High Capacity) SDXC (SD Extended Capacity) and SDIO (SD Input Output), available in three sizes: SD, miniSD and microSD.


SD memory cards (Secure Digital) were developed from the MMC (MultiMediaCard) format and are currently dominant memory card and has become the de facto standard in the industry, so there are plenty of electronic devices incorporating memory card reader SD, Laptop Dealer and Supplier as digital cameras, game consoles, camcorders, PDAs, laptops or mobile phones.


The formats of memory cards SD Secure Digital develops the Card Association, with four standards:

SDSC (Secure Digital Standard Capacity): the original standard SD 1.0, known as SD, maximum capacity is 2 GB, but some manufacturers extend it to 4 GB.

SDHC (Secure Digital High Capacity): SD version 2.0 determines a capacity of 4-32 GB.

SDXC (Secure Digital Extended Capacity): the SD 3.0 standard provides a capacity between 32 GB and 2 TB.

SDIO (Secure Digital Input Output): the SDIO standard SD slots can use the interface to connect devices such as GPS receivers, Wi-Fi adapters or Bluetooth, barcode readers, fingerprint scanners, modems or TV tuners or FM radio.

Each of the standards SDSC / SDHC / SDXC / SDIO establishes different communication protocols, so that although modern readers implement backward compatibility with previous versions, the older readers will not recognize the new card, Dell Laptops in islamabad or if they do it will be limited to 2 GB or 4 GB, not being able to write well in higher capacity cards, which may result in data loss. Some older drives can support SDHC through a firmware update.


Regarding the dimensions and form factors of memory cards SD, three sizes:

SD: 32x24x2.1 mm

miniSD: 21.5x20x1.4 mm

microSD: 15x11x0.7 mm


Generally SD memory cards are formatted FAT16, while SDHC cards are typically formatted as FAT32. Although both types of cards can support other file systems is not recommended to change the file system nor reformat the card, as it can cause performance problems, incompatibility or affect the life of the card.


You can access the contents of an SD card using a specific reader or using a USB adapter. The smaller size cards, miniSD and microSD can be used in SD slots with adapters, which are basically passive devices that electrically connect the pins of the card and the SD slot.

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