Testing and comparing new MicroSD brand...

***If this is the wrong section, please let me know and I will move the thread.

Hey guys, I've never tested nor done much with microSD cards in regards to comparing them for speed but I purchased a Firefly 6S a few weeks back and wanted more space so I recently purchased a Class 10, 64gig, with a speed class of U3 (Name/model withheld for the time being)

I used H2Testw 1.4 to compare the card to a Lexar 300x, Class 10, 32gig, Speed U1.

Results:
Lexar 300x
Class 10, U1


Here is the CrystalDiskMark test output:


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Here is the CrystalDiskMark test output:



Based on the results above, you can see the difference in write/reads but for a Speed class rating 3 for the **other card**. What do you guys think? Does this card seem to be a USH 3 class card?

Looking at the standard for minimum's, UHS3's minimum write speed is 30MB/s.


Is there a reason that each card spit out different read/write's based on the program being used? Which would be more accurate to reference?


Thank you

Flash card speeds have always been all over the place. Personally, I wouldn't much faith in an SD cards speed unless speed was specifically something you were worried about in the job role the card would see.

Just going off a wild guess in this instance I would say it might be related to the capacity of the cards. the 64GB could be newer and thus faster NAND flash in general. Or that the 64GB model is using two 32GB NAND packages internally in parallel so it's able to read/write from 2 sources at once (striped data).

And of course this is all based on the assumption that you used the same card reader for both cards, cause card readers is a WHOLE other can of worms.

westrock2000 said:

Flash card speeds have always been all over the place. Personally, I wouldn't much faith in an SD cards speed unless speed was specifically something you were worried about in the job role the card would see.

Just going off a wild guess in this instance I would say it might be related to the capacity of the cards. the 64GB could be newer and thus faster NAND flash in general. Or that the 64GB model is using two 32GB NAND packages internally in parallel so it's able to read/write from 2 sources at once (striped data).

And of course this is all based on the assumption that you used the same card reader for both cards, cause card readers is a WHOLE other can of worms.

Click to expand...

Thanks for the reply.

The card that I used was an experiment that I am quite pleased with. Netac 64gb. class 10, UHS3 card.

P500 64GB(Class 10，UHS-I U3)-Shenzhen Netac Technology Company Limited

Netac P500 64GB Micro SD Memory Card

We will see how this performs over time, the card was a low cost item and a test to see how well it performs. The review's have been quite good which caught my interest in this.

UHS is the bus. The U rating is the minimum sustainable transfer rate to classify the card. Many retailers don't know the difference and advertise incorrectly which causes confusion. Also you need a UHS capable device for max speed.

SD Card Speed Classes, Grades, Bus Modes, and File Systems Explained | PC Perspective

http://www.cnet.com/news/sandisk-rolls-out-speedy-uhs-ii-u3-extreme-pro-sd/