Review on Ultra High-Speed USB 3.0 Flash Drive 1TB - F-Security Memory Stick 1000GB, Compatible with Computer/Laptop, Portable Metal Thumb Drive with Rotated Design - Read/Write Speeds up to 100Mb/s by Lori Fleurosier

Used on Mac. Slow transfer of 3.5GB music files, 30 minutes. I wanted to transfer about 50 GB, gave an estimated time of 8 hours. A larger transfer canceled. Device crashed while transferring some small folders, <200MB. No longer recognized by the computer. Other flash drives work, so no comp. Worked a little less than an hour. I will not return it as it now contains personal information. And I don't want backup replacements if they're prone to failure. I bought two, undecided if I would try the second one.