These drives are formatted in ex-fat, so I tried them in that format first. They are very fast. It moved a 327MB video file in less than 15 seconds. It erased it from the flash drive back to my desktop hard drive even faster, in under 10 seconds. Then I formatted them in Fat32. However, it quickly moved and copied the same file, but about 20% less, and is about halfway between ex-fat and fat32 formatting. They never seem to get hot, they just keep you warm, which is always a good thing. The outer blue or red cover is made of lightweight aluminum. Has a keychain hanger to attach your keychain to, or wire for hanging or carrying. I deleted mine as I will never need it and it was easy. Features a red LED at the top that flashes when a drive is being moved, copied, or accessed, and glows red when it's currently connected and powered on. Whilst the lid is metal the case is plastic but seems very well made, I wouldn't just leave them in my pocket and expect them to go through the wash and survive, not very many flash drives are waterproof at all . For the price you just can't beat them, very impressed.
Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
65 Review
Kingston DataTraveler flash drive 100 G3 256 GB, 1 pc. black
74 Review
Titan Gray Samsung BAR Plus 256GB USB 3.1 Flash Drive (MUF-256BE4/AM) with Up to 400MB/s Transfer Speed
69 Review
Samsung BAR Plus 128GB - High-Speed USB 3.1 Flash Drive Titan Gray (MUF-128BE4/AM)
67 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 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
95 Review