Errors in data transmission?

I use the stick to my laptop via USB 3.0. He is about twice too fast (write rate) as the internal card reader. He is fucking hot when using. But what makes me distrust most about it is that if I so check SD card via H2testw program, I am often drawn to fault the SD card programmed for - here, for example, from my Sony SF32U:

Warning: 30882 30883 MByte tested.
The disk is probably defective.
30.1 GB OK (63,246,240 sectors)
48K DATA LOST (96 sectors)
Details:
0 KByte overwritten (0 sectors)
0 KByte slightly distorted (48 KByte with garbage (96 sectors)
0 KByte used multiple times (sectors 0)
First error at offset: 0x0000000618c98000
Target: 0x0000000618c98000
Is: 0x840c22224ac80424
H2testw Version 1.3
Write rate: 33.2 MB / s
Read rate: 66.6 MB / s
H2testw v1.4

I check the same SD card again in the notebook internal card reader, then no errors are displayed.

Warning: 30882 30883 MByte tested.
Ready, no error occurred.
You can delete the test files * .h2w now or to taste
check again.
Write rate: 15.6 MB / s
Read rate: 19.0 MB / s
H2testw v1.4

This happens to me not only with an SD card. Does anyone have similar experiences gemachtt it? If the Transcend card reader defect, or should not trust the test program?