Don't trust what they write ON plastic! Trust only what you test!

Three SD cards tested, see here what is write on them: What they write on label - click here

Tested with h2testw_1.4 (google for it, it's free and small).

Results:

Sandisk Extreme class 6 (20 MB/s* on label) - 4 GB capacity

Writing speed tested: 12.3 MByte/s

Reading speed tested: 14.1 MByte/s

Sandisk class 2 - 8GB capacity

Writing speed tested: 5.40 MByte/s

Reading speed tested: 7.32 MByte/s

HAMA class 6 - 8GB capacity (don't know why Hama has a 10 in a circle and a 6 in another circle).

Writing speed tested: 12.3 MByte/s

Reading speed tested: 14.0 MByte/s

Trust me, on a DSLR camera in high speed mode you will shoot about 6-7 photos at high speed and after that the buffer will be full and SD card write speed limit will slow you down. Let's say you shoot RAW+Jpeg fine, this is about 11 MB+5MB (body with 12 MP sensor). So, after first 6-7 photos you will have to transfer on card about 16 MB. On a card with ~ 12 MB/s this will be more than 1 second. On a class 2 card (5.4 MB/s in my test) you will wait about 3-4 seconds before next shoot!

Conclusion: buy faster and more expensive cards if you are a sport or action shooter.

See ya! Dorian King out. (click on Useful you lazy!)

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September 09, 2012

Alvera

no, they don't will be interested :) they have an * after that number (special testing condition) and the write speed is never published.

September 09, 2012

Miraclemoments

Yes...maybe you should direct an email to them and find out what they say...will be interesting to hear what they say.

September 09, 2012

Alvera

don't know, maybe are fakes, pirated
With this "30 mbps ultra" my d90 shoot about 8 NEF at full speed and after that about 1 photo per second. At action photography 1 fps is very low :(

September 09, 2012

Miraclemoments

Thanks for the info....what I would like to know is how would Sandisk respond to these findings. Does this verge on false advertising??

September 09, 2012

Alvera

Updated with a Sandisk card. On plastic 30 MBps but working like a 20 MBps Sandisk :( Same results. See link above.

September 01, 2012

Alvera

Blog updated with a Warning about poor performance of an TDK card. See here: http://alveraphoto.blogspot.ro/2012/08/real-write-speed-test-on-sd-card.html
Photo of the card attached at the end of post.

September 01, 2012

Giannit

Thanks for this info....

August 31, 2012

Alvera

This is my advice, but don't waste the money if you don't shoot action. I made some photos at a navy parade (airplanes and speed boats) and at a drifting race (see my last images) and it was hard without speed cards.

August 31, 2012

Celiaak

Nice advice. Will be updating my SD then.

August 31, 2012

Thanatonautii

That`s good info! Thanks for sharing!

August 30, 2012

Alvera

You are welcome.

August 30, 2012

Egomezta

Thanks good to know...

August 30, 2012

Alvera

yes, but only on full hd, on 720p a writing speed of 5MB/s is enough.

August 30, 2012

Axelldotcom

The high speed cards are also good if you record video with your DSLR. I tried and rejected 4 cards(I won't give names) before I got the right one.

August 29, 2012

Fishwater

Hey, thanks for this info. I've never even thought about it, but I'll consider upgrading to some new SD cards now (or at least one for action shots).

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Photo credits: Mohamed Osama.