How to Buy an SD Card: Speed Classes, Sizes, and Capacities Explained

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** How-To Geek **

*How to Buy an SD Card: Speed Classes, Sizes, and Capacities Explained*

standard-sd-cards-and-microsd-cards

Memory cards are used in digital cameras, music players, smartphones,
tablets, and even laptops. But not all SD cards are created equal — there
are different speed classes, physical sizes, and capacities to consider.

Different devices require different types of SD cards. Here are the
differences you’ll need to keep in mind when picking out the right SD
card for your device.

[INS: :INS]

-Speed Class-

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In a nutshell, not all SD cards offer the same speeds. This matters for
some tasks more than it matters for others. For example, if you’re a
professional photographer taking photos in rapid succession on a DSLR
camera saving them in high-resolution RAW format, you’ll want a fast SD
card so your camera


Source: www.howtogeek.com/189897/how-to-buy-an-sd-card-speed-classes-sizes-and-capacities-explained/


how are sd cards classes


Secure Digital - Wikipedia, the free encyclopedia

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** Secure Digital **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
"SDHC" redirects here. For the gene, see SDHC (gene).

SD, SDHC, SDXC
SD-Logo.svg
SD Cards.svgSD (top), miniSD, microSD cards
Media type Memory card
Capacity SDSC (SD): 1 MB to 2 GB,
   some 4 GB were made
SDHC: >2 GB to 32 GB
SDXC: >32 GB to 2 TB
Developed by SD Association
Dimensions Standard: 32.0×24.0×2.1 mm (1.260×0.945×0.083 in)
Mini: 21.5×20.0×1.4 mm (0.846×0.787×0.055 in)
Micro: 15.0×11.0×1.0 mm (0.591×0.433×0.039 in)
Weight Standard: ~2 g
Mini: ~0.8 g
Micro: ~0.25 g
Usage Portable devices, including digital cameras and handheld computers
Extended from MultiMediaCard (MMC)

*Secure Digital* (*SD*) is a non-volatile memory card format developed by
the SD Card Association (SDA) for use in portable devices.

The standard was introduced in August 1999 by joint efforts between
SanDisk, Panasonic (Matsushita Electric) and Toshiba as an improvement over
MultiMediaCards (MMC),^[1] and has become the industry standard. The three
companies formed SD-3C, LLC, a company that licenses and enforces
intellectual property rights associated with SD memory cards and SD host
and ancillary products.^[2]

The companies also formed the SD Association (SDA), a non-profit
organization, in January 2000 to promote and create SD Card standards.^[3]
SDA today has about 1,000 member companies. The SDA uses several
trademarked logos owned and licensed by SD-3C to enforce compliance with
its specifications and assure users of compatibility.^[4]

There are many combinations of form factors and device families, although
as of 2016, the prevailing formats are full or micro size SDHC and SDXC
cards.^[/citation needed/]

*Contents*

· 1 Overview

· 1.1 SD
· 1.2 SDHC
· 1.3 SDXC

· 1.3.1 exFAT filesystem

· 1


Source: en.wikipedia.org/wiki/Secure_Digital

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