Update: died after receiving and using 3 of them! Slowly to your work, then death. It must be USB 2.0. However, they transfer data more slowly than older USB 1.0! I've tried all 4 and they have very low data rates. In addition, if you write to one of them, there is a delay of about 4 seconds before anything is transmitted. I use flash drives all the time and usually 5-6 a day. Those are the only ones I have that have this problem.
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
32GB SanDisk USB Flash Drive (SDCZ430-032G-A46)
78 Review
Kingston DataTraveler SE9 32GB USB 2.0 Flash Drive for Reliable Data Storage (DTSE9H/32GBZ)
69 Review
Samsung BAR Plus 128GB USB 3.1 Flash Drive - 400MB/s - Champagne Silver (MUF-128BE3/AM)
65 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review