Bought for "emergency" boot flash drive, for DOS utilities - 4 Gb is best. I use it to copy / restore / maintain systems on RAIDs - it's convenient, it sees arrays without additional drivers. The speed under the OS depends on the settings of the OS (and antivirus).
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
Kingston DataTraveler flash drive 100 G3 256 GB, 1 pc. black
74 Review
32GB SanDisk USB Flash Drive (SDCZ430-032G-A46)
78 Review
Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
65 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
2 TB External HDD ADATA DashDrive Durable HD650, USB 3.2 Gen 1, Blue
55 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review