The USB sticks worked during the first test. After 1 or 2 uses, the first USB flash drive had trouble loading data and eventually stopped working. If a faulty stick is inserted into the USB stick, you will receive a message: Please insert the disc into the USB stick (E:). I was able to get my money back for this particular flash drive but it still doesn't work. Update 12/14/18: If you use another flash drive after downloading several files and don't use the flash drive for more than a month, the other flash drive failed. and has trouble accessing information. I would recommend that you look elsewhere if you need a reliable USB drive to store your files.
Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
65 Review
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
Samsung BAR Plus 128GB USB 3.1 Flash Drive - 400MB/s - Champagne Silver (MUF-128BE3/AM)
65 Review
Compact and Convenient: SanDisk Cruzer Fit USB 32GB Flash Drive (SDCZ33-032G-A11)
66 Review
π Seagate Backup Plus Slim STHN2000400 2TB Portable Hard Drive - Black: Your Reliable External Storage Solution
93 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review