It was discovered that these flash drives have unreliable connectors. Often I plug them in and the computer doesn't recognize them. If I shake them in the connection, the device recognizes them, although afterwards I worry about the integrity of the connection. I don't have this problem with drives from other manufacturers on the same USB ports (so don't blame the USB port). Since storage is a matter of reliability, I would not recommend these USB sticks. Update: 2018-11 - The seller refunded me the purchase price.
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
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