https://bugzilla.kernel.org/show_bug.cgi?id=219300 --- Comment #10 from nxe9 (linuxnormaluser@xxxxxxxxx) --- OK, thanks. You convinced me. @Theodore Tso: Thank you for your detailed post. As I wrote in the first post, i tried f2fs once and it also broke the data. This confirms your claims. I tried the „basic-veryfy.fio“. Unfortunately, this method is not very practical, because in the case of my pendrive, the verification time is about 60 days. After 10 hours I stopped. The progress was less than one percent. Another properly functioning pendrive would also require many days. Perhaps this method would generate an error, but it is very cumbersome.