Test SD card or usb read/write speed by terminal Linux Ubuntu

Find out which device it mounts as and run hdparm -t. For 
instance, if I plug a USB pendrive in it mounts as /dev/sdb so writing in the terminal: 

Sudo hdparm -t /dev/sdb

and the result like that:

And now we need to talking about where use that.
When you bey a SD cart or USB flash you look to the company add the speed of the cart or USB  in cercal, this cercle is the class, and the class is mayen the level of the speed of the cart or usb, look in this table:

So when we have a SD cart class 10 we need fond the speed is 10 MB/S after test with this method. if no so the SD cart no good or not original.

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