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Forums - General - Understanding the speed class of SDHC

Galaki on 29 June 2011

source

Rating Read Speed
(Mbit/s)		 Read Speed
(MB/s)		 Write Speed
(Mbit/s)		 Write Speed
(MB/s)		 Speed
Class
6× 7.2 0.9
10× 12.0 1.5
13× 16.0 2.0 16.0 2.0 2
26× 32.0 4.0 32.0 4.0 4
32× 38.4 4.8 40.0 5.0
40× 48.0 6.0 48.0 6.0 6
66× 80.0 10.0 80.0 10.0 10
100× 120.0 15.0 120.0 15.0 15
133× 160.0 20.0 160.0 20.0 20
150× 180.0 22.5 180.0 22.5 22.5
200× 240.0 30.0 240.0 30.0 30
266× 320.0 40.0 320.0 40.0 40
300× 360.0 45.0 360.0 45.0 45
400× 480.0 60.0 480.0 60.0 60
600× 720.0 90.0 720.0 90.0 90

When you buy memory cards, they are usually labeled by "Speed Class", last column.

The "Rating" is usually only listed on Sandisk memory cards, usually high end and expensive.

However, currently, Class 10 rating are used for both 66x and 100x. I don't know why they don't just call it Class 15, LOL.

So, when you shop for a new card, be aware of the quality you're getting.

I.E. I could currently buy a Patriot 16GB C10 SDHC for $25  or a Kingson 16GB C10 for $30. However, the Kingston card is actually Class 15. That's a whopping 50% more write speed for $5.

Anyone know what speed class the SD card that came with 3DS?



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Hephaestos on 29 June 2011

last card I bought was a class 10.... the previous one on my phone was class 4.... I now have writing speed problems.

buy mainstream cards, not amazon marketplace merchant cards, they are likely fake (even if in new box) if good priced.



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Xen on 29 June 2011

Is there any way that this relates to memory sticks? Because I'm gonna get one soon for my PSP.



Galaki on 29 June 2011
Xen said:
Is there any way that this relates to memory sticks? Because I'm gonna get one soon for my PSP.

Not sure about Speed Class, but going by Rating is the best way, IMO.



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Xen on 29 June 2011
Galaki said:
Xen said:
Is there any way that this relates to memory sticks? Because I'm gonna get one soon for my PSP.

Not sure about Speed Class, but going by Rating is the best way, IMO.

I'll try that!



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Vetteman94 on 30 June 2011

Well thats interesting, but I have a question. I am interested in this SD card for my new Sony camera, and it says its a class 1, which according to your chart isnt great. But on the front of the card it specifically states that its 45MB/s read/write speed. But that would be a class 45 according to the chart. Why?

Here is the card in question:

http://www.amazon.com/SanDisk-SDSDXP1-016G-A75-16GB-Extreme-Memory/dp/B004LB5AUY/ref=sr_1_1?ie=UTF8&qid=1309387697&sr=8-1