An SD Card (Secure Digital Card)
is an extremely compact flash memory card built to provide high-capacity memory
in a compact size. SD cards are utilized in numerous small portable devices
like digital cameras, digital video camcorders, portable PCs, audio players and
mobile devices. Being used ever since 1999, SD Memory Cards are now obtainable
in capacities between 16 Megabytes and 1 Gigabyte. An SD card generally
measures 32 x 24 x 2.1 mm and weighs roughly 2grams.
A Secure Digital (SD) card is a
tiny memory card utilized to make storage space conveniently between a variety of
devices, for example car tracking systems, cell phones, Smart phones, PDAs,
EBooks, cameras, music players, camcorders, and PCs. An SD card featuring very
high data transfer rate and low battery consumption, both major considerations
for compact devices. It makes use of flash memory to provide nonvolatile storage,
meaning a power supply doesn't need to keep stored information.
An SD card is about the dimension
of a postage stamp and weighs roughly two grams. It is comparable in size to a Multimedia
Card, but yet not as big as older memory card types like the Smart Media card
and the CompactFlash card. Both MMC and SD cards provide encryption features
for safeguarded content to ensure secure distribution of copyrighted material,
for example video, digital music, and e-books. SD cards can be found with
storage capacities as high as 4 gigabytes or even more.
SD cards tend to be more reliable
than standard storage media. They have an operating shock score (fundamentally,
the height you can drop them from and still have them work) of 2, 000Gs, in
comparison to a 100-200 G rating for the mechanical drive of the standard
portable device. This translates to a decrease to the floor from 10 feet, when
compared with one foot for the mechanical disk drive. Both MMC and SD cards
utilize metal connector contacts, rather than the traditional pins-and-plugs,
so they aren't as vulnerable to damage during handling.
The SD card was jointly created by Matsushita, SanDisk,
and Toshiba.
The Secure Digital standard was
created in August 1999 as an evolutionary enhancement over MultiMedia Cards (MMC).
The Secure Digital standard is taken care of by the SD Association (SDA). SD
technologies have been applied in above 400 brands across numerous product
categories and more than 8, 000models.
The Secure Digital format
consists of four card families available in three various form factors. The
four families are the unique Standard-Capacity (SDSC), the High-Capacity (SDHC),
the extended-Capacity (SDXC), along with the SDIO, which brings together
input/output features with data storage. The three form factors are the actual size,
the "mini" size, and the "micro" size. Electrically passive
adapters enable the utilization of a compact card in a host device designed to
hold a bigger card.
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