If copy speed is important to you, you can try a different brand of flash drive. I made copies of 972 files contained in 50 folders that take up about 7.5GB of space. Copying to these Netac flash drives takes 57 minutes. To make the exact same copies, it takes 99 minutes on XinwaY, 25 minutes on SanDisk, 18 minutes on Juanwe, and just 15 minutes on Imphomius.
32GB SanDisk USB Flash Drive (SDCZ430-032G-A46)
78 Review
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
Titan Gray Samsung BAR Plus 256GB USB 3.1 Flash Drive (MUF-256BE4/AM) with Up to 400MB/s Transfer Speed
69 Review
Kingston DataTraveler flash drive 100 G3 256 GB, 1 pc. black
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8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
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