I bought three of these devices and after much frustration gave up two of them. After thousands of images are copied onto it, they appear unformatted. I reformatted them to other file systems and they still failed. As an IT professional, I've used hundreds of flash drives and this is the worst I've ever tried.
Kingston DataTraveler SE9 32GB USB 2.0 Flash Drive for Reliable Data Storage (DTSE9H/32GBZ)
69 Review
Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
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Kingston DataTraveler flash drive 100 G3 256 GB, 1 pc. black
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Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
π Seagate Expansion 3TB Portable USB 3.0 External Hard Drive (STEA3000400) in Black
60 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
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π Seagate Backup Plus Slim STHN2000400 2TB Portable Hard Drive - Black: Your Reliable External Storage Solution
93 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review