Small, robust and fast

Check ___ functioning ___
Basically, I recommend the purchase of flash memory (USB sticks, SD cards ...) the product immediately after purchase with the freeware tool "H2testw" (search on google) to check for memory errors. Here is a summary appears at the end in which you can learn something about the performance.

___Performance____
Writing: 3816 MB in 6:35 min, ie with 9.64 MB / s
Read: 3816 MB in 2:37 min, ie with 24.2 MB / s