I bought 32gb samsung evo + after seeing few raspberry pi micro sd card speed tests, and my card is not performing very well..
can you tell me if i'm doing something wrong?
32gb evo + can theoretically gain 20 MB/s write and 95 MB/s read speeds, i know that i will not get these speeds..
First i put micro sd card in laptop sd card slot with windows os and ran few tests.. When i transfer big files from and to sd card i get around 20 MB/s write and 80 MB/s read speeds..when i transfer 100+ photos i get 10+ MB/s write speed.. Then i ran CrystalDiskMark and i also got around 20 MB/s write and 80 MB/s read speeds, and sequential speed around 7 MB/s read and 1 MB/s write..
On fresh Raspbian install i ran these tests that contain hdparm, dd, and iozone..
| sudo bash
curl https://raw.githubusercontent.com/geerl ... chmarks.sh
| sudo bash
and when i saw poor performance i tried to overclock sd card with dtparam=sd_overclock=100 line in boot/config.txt and performance was little better but far from raspberry pi micro sd card tests i saw on the net..
i get 0.7 MB/s random write in iozone, in tests on the net people are getting 3.0 MB/s speeds with that micro sd card..
i ran tests in 3 rounds to be sure, these are screenshots of my tests in imgur album bellow
If you have some suggestions, please share.. Thanks