Originally published at: http://www.howtogeek.com/189897/how-to-buy-an-sd-card-speed-classes-sizes-and-capacities-explained/
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.
In the sentence "SD cards will only fit into marching slots. You can’t plug a microSD card into a standard SD card slot — it won’t fit." The word "marching" should be "matching".
Quote.There are four different speed classes — 10, 8, 4, and 2. 10 is the fastest, while 2 is the slowest. Class 2 is suitable for standard definition video recording, while classes 4 and 6 are suitable for high-definition video recording. End Quote
In the first part you do not mention speed 6 but do in the second part. Which is it, 8 or 6? A bit of proof reading will go a long way.
Interesting article though.
the 1 is UHS 10MB/sec, and the 3 is UHS 30MB/sec. Note that's megabytes, not megabits.
From what I can tell, C10 and U1 are basically the same speed, but I think there's a new communication technology at play there; the page here shows them being used interchangeably on cameras requiring U1 or C10 cards, although it looks like you can't use a C10 card in a camera that is only rated for UHS cards.
Here it is: "UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 312 Megabytes per second for greater device performance. It is available on SDXC and SDHC memory cards and devices."
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