sdcard speed problem

[theimmortalbg]

For my galaxy s4 I bought microSDHC card adata premier - Premier microSDHC/SDXC UHS-I Class10_Memory Cards_ADATA Technology this one.
Here is the speed charts - Charts, benchmarks SD Cards 2014, [2] Sequential Write [MB/s] - its almost 20mb/s.
My card is much much slower than this. I bought it from very trusted shop in my town so its impossible to be fake. The write speed when I write mp3 files (4mb avg) is 4mb/s when I copy through cable (from pc to the phone's sdcard). When I write directly to the sd card with card reader its 8mb/s. So what happens? Is anybody have the same problem? Is it normal when I use cable the speed to be slower than with card reader. Why the speed is at least 2 times slower than in tests? (the card is formated in fat32).

 

[dezymond]

Lots of useful information in this thread: http://forums.androidcentral.com/sa...ies/267781-class-speed-sd-card-galaxy-s4.html

In a nutshell: Android isn't capable of writing speeds that class 10 supports, a lower class could even yield faster transfer speeds. I believe the s4 is rated at a class 6 as the highest supported

 

[dezymond]

And here's another good article regarding class speeds: http://samsunggeeks.com/2012/05/20/micro-sd-cards-smartphones-speed-class-explained/#.U8iuAfldU0o

 

[leeshor]

Your link was to a 64GB card which the S4 has known problems with. If it is indeed a 64GB card I would swap it for 2 32GB cards post haste.